Ch. 7 Pr. 1
For a population containing N=902 individuals, what code number would you assign for; a. The first person on the list= 001
b. The fortieth person on the list= 040
c. The last person on the list= 902

Ch. 7 Pr. 13
What additional information would you want to know about the survey before you accepted the results of the study? -Why was the study conducted? –What was the margin of error? –What was the sample size? -What sampling design was used? –What was the response rate? –What was the frame that was used? -Who paid for the survey? –From the sample that was selected, what was the population? Ch. 7 Pr. 17

For each of the following three populations, indicate what the sampling distribution for samples of 25 would consist of: a. Travel expense vouchers for a university in an academic year. -The sampling distribution of a sample means is the distribution of means from all possible samples of 25 vouchers that could possibly happen. Ch. 7 Pr.24

A random sample of 50 households as selected for a telephone survey. The key question asked was, “Do you or any member of your household own a cellular telephone with a built in camera?” Of the 50 respondents, 15 said yes and 35 said no. a. Determine the sample proportion, p, of households with cellular telephones with built-in cameras. P=x/n

P=15/50=0.30
-30% of the households surveyed had cell phones with cameras.
b. If the population proportion is 0.40 determine the standard error of the proportion.

-We can use the standard normal curve for binomial data in cases where we have a big sample.

Ch. 7 Pr. 33
Why is the sample mean an unbiased estimator of the population mean? -The sample mean is an unbiased estimator of the population means due to the average of all of the possible sample means of a size is equal to the population mean. Ch. 7 Pr. 34

Why does the standard error of the mean decrease as the sample size, n, increases? -Variation of the sample means becomes smaller...

...Worksheet 7-A: Metabolism Exercises
Name __ _________________________
Metabolism explains how the cells in the body use nutrients to meet its needs. Cells may start with small, simple compounds and use them as building blocks to form larger, more complex structures (anabolism). These anabolic reactions involve doing work and so require energy. Alternatively, cells may break down large compounds into smaller ones (catabolism). Catabolic reactions usually release energy. Determine whether the following reactions are anabolic or catabolic. Indicate whether each of the following reactions is anabolic or catabolic.
Reaction Type of Reaction
1. Glucose + glucose → glycogen Anabolic Catabolic
2. AB → A + B Anabolic Catabolic
3. Glycerol + fatty acids → lipids Anabolic Catabolic
4. Glycolysis Anabolic Catabolic
5. Glucose molecules linked to form glycogen Anabolic Catabolic
6. Electron transport chain Anabolic Catabolic
7. Oxidation reaction...

...TCO 1) What is the purpose behind the five primary activities in the value chain?
First, info flow diagrams and flowcharts argon the two most much utilize development and musical accompaniment tools employ today. Second, since systems developme nt is super complex, DFDs and flowcharts ar! e tools that are used to fix order from sanatorium and complexity.Â (Ch 3, p. 50)| | | Â | Points Received:| 4 of 5| Â | Comments:| First, data flow diagrams and flowcharts are the two most frequently used development and documentation tools used today. Second, since systems development is extremely complex, DFDs and flowcharts are tools that are used to create order from chaos and complexity.| |
TCO 1) Name two reasons why it is important to have a working knowledge of DFDs and flowcharting. (Points TCO 1) Name two reasons why it is important to have a working knowledge of DFDs and flowcharting. (Points
The flow diagram and the flowcharts are the two more common systems use. Also when it comes to the system development they can get very complex meaning that the DFD and the flowchart are tools that can be used to create order form chaos and complexity.
TCO 1) What is the purpose behind the five primary activities in the value chain?
First, info flow diagrams and flowcharts argon the two most much utilize development and musical accompaniment tools employ today. Second, since systems developme nt is super complex, DFDs and flowcharts ar! e tools that are used to fix order from...

...1.a．Mnually calculate the mean, median, and mode or modes for the following samples:
(i) 7, 4, 6, 2, 6, 7, 3, 5
(ii) 0, -3, 5, -2, -6, 4, 7, 9, 4, -3, 0, 2
b. The number of days for which each of 15 office workers of a firm was absent during a one-month period is as sfollows:
0, 1, 1, 3, 0, 0, 2, 5, 0, 1, 1, 2, 0, 1, 1
Calculate the interquartile range, variance and standard deviation of the number of days absent.
2. The number of hours a student spent studying for a statistics course over the past seven days was recorded as follows:
2, 5, 6, 1, 4, 0, 3
Calculate the range, ,and for these data. Express each answer in appropriate units.3，4.67，2.16
3. Consider the percent change in housing values over a five-year period for regions of the United States, as shown in the following table. Draw a box plot.
Percent change in housing values over five years for U.S. regions.
Region Percent Change Region Percent Change
New England 54.5% West North Central 38.3%
Pacific 48.9 West South Central 29.5
Middle Atlantic 35.3 East North Central 32.0
South Atlantic 33.6 East South Central 26.0
Mountain 34.2
4. Two events are mutually exclusive, one with probability 0.38 and the...

...scheduling and network models.
Chapter 1 illustrates a number of ways to summarise the information in data sets, also known as
descriptive statistics. It includes graphical and tabular summaries, as well as summary measures
such as means, medians and standard deviations.
Uncertainty is a key aspect of most business problems. To deal with uncertainty, we need a basic
understanding of probability. Chapter 2 covers basic rules of probability and in Chapter 3 we
discuss the important concept of probability distributions in some generality.
In Chapter 4 we discuss statistical inference (estimation), where the basic problem is to estimate
one or more characteristics of a population. Since it is too expensive to obtain the population
information, we instead select a sample from the population and then use the information in the
sample to infer the characteristics of the population.
In Chapter 5 we look at the topic of regression analysis which is used to study relationships
between variables.
In Chapter 6 we study another type of decision making called decision analysis where costs and
proﬁts are considered to be important. The problem is not whether to accept or reject a statement
but to select the best alternative from a list of several possible decisions. Usually no statistical
data are available. Decision analysis is the study of how people make decisions,...

...
Contents
Question 1 3
Question 2a 5
Question 2b 6
Question 2c 7
Question 3a 8
Question 3b 8
Question 3c 10
Question 3d 11
Question 4 12
Question 5 14
References 15
Question 1
The sampling method that Mr. Kwok is using is Stratified Random Sampling Method. In this case study, Mr Kwok collected a random sample of 1000 flights and proportions of three routes in the sample. He divides them into different sub-groups such as satisfaction, refreshments and departure time and then selects proportionally to highlight specific subgroup within the population. The reasons why Mr Kwok used this sampling method are that the cost per observation in the survey may be reduced and it also enables to increase the accuracy at a given cost.
TABLE 1: Data Summaries of Three Routes
Route 1
Route 2
Route 3
Normal(88.532,5.07943)
Normal(97.1033,5.04488)
Normal(107.15,5.15367)
Summary Statistics
Mean
88.532
Std Dev
5.0794269
Std Err Mean
0.2271589
Upper 95% Mean
88.978306
Lower 95% Mean
88.085694
N
500
Sum
44266
Summary Statistics
Mean
97.103333
Std Dev
5.0448811
Std Err Mean
0.2912663
Upper 95% Mean
97.676525
Lower 95% Mean
96.530142
N
300
Sum
29131
Summary Statistics
Mean
107.15
Std Dev
5.1536687
Std Err Mean
0.3644194
Upper 95% Mean...

...Trajico, Maria Liticia D.
BSEd III-A2
REFLECTION
The first thing that puffs in my mind when I heard the word STATISTIC is that it was a very hard subject because it is another branch of mathematics that will make my head or brain bleed of thinking of how I will handle it. I have learned that statistic is a branch of mathematics concerned with the study of information that is expressed in numbers, for example information about the number of times something happens. As I examined on what the statement says, the phrase “number of times something happens” really caught my attention because my subconscious says “here we go again the non-stop solving, analyzing of problems” and I was right. This course of basic statistic has provided me with the analytical skills to crunch numerical data and to make inference from it. At first I thought that I will be alright all along with this subject but it seems that just some part of it maybe it is because I don’t pay much of my attention to it but I have learned many things. I have learned my lesson.
During our every session in this subject before having our midterm examination I really had hard and bad times in coping up with this subject. When we have our very first quiz I thought that I would fail it but it did not happen but after that, my next quizzes I have taken I failed. I was always feeling down when in every quiz I failed because even though I don’t like this...

...variation E. All of the above are components 4. The possible values for the Durbin-Watson statistic are A. any value B. any value greater than zero C. any value from 0 to 4 inclusive D. any value less than zero. 5. A question has these possible choices—excellent, very good, good, fair and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results? A. 0 B. 2 C. 4 D. 5
6. What is the critical value at the 0.05 level of significance for a goodness-of-fit test if there are six categories? A. 3.841 B. 5.991 C. 7.815 D. 11.070 7. What is our decision regarding the differences between the observed and expected frequencies if the critical value of chi-square is 9.488 and the computed value is 6.079? A. The difference is probably due to sampling error; do not reject the null hypothesis B. Not due to chance; reject the null hypothesis C. Not due to chance; do not reject the alternate hypothesis D. Too close; reserve judgment 8. The chi-square distribution is A. positively skewed. B. negatively skewed. C. normally distributed. D. negatively or positively skewed. 9. Two chi-square distributions were plotted on the same chart. One distribution was for 3 degrees of freedom and the other was for 12 degrees of freedom. Which distribution would tend to approach a normal distribution? A. 3 degrees B. 12 degrees C. 15 degrees D. All would 10. If the Durbin-Watson statistic has a value close to 0 or...

...PAM 3100: Homework7
Question 1
Go to the list of datasets located on the website http://wps.aw.com/aw_stock_ie_3/178/45691/11696965.cw/index.html . Right-click the one named “Guns Data (Stata dataset)”, save it somewhere you can access it and then open it in Stata. This dataset contains panel data from 50 states plus the District of Columbia for the years 1977 through 1999. A detailed description is given in the ﬁle “Guns Data Description (PDF)” on the same page. We are interested in the eﬀects of “shall-issue” laws relating to concealed handguns. The variable “shall” is 1 if a state has such a law, 0 otherwise. States that have “shall-issue” laws *shall* (i.e., must) give a concealed gun permit to anyone that wants one (and isn’t a felon, mentally incompetent). States that do not have “shall-issue” laws may issue permits, but generally do so only to certain types of people (i.e., their laws are much stricter). Proponents of “shall-issue” laws argue that they will reduce crime, because criminals will be deterred by the knowledge that some people are carrying guns. Critics argue that “more guns means more crime”. 1. The outcome we will analyze is the log of violence (i.e., you need to create a variable such as ln_vio using a command such as “gen lnvio=ln(vio)”. Why is it convenient to use the log of violence as the outcome variable (rather than the number of violent incidents as recorded by “vio”)? [2 points] 2. Estimate a regression of...