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#1 Find the standard error of the mean for each sampling situation (assuming a normal population). What happens to the standard error each time you quadruple the sample size? a. σ = 36, n = 9 36

√9=12
b. σ = 36, n = 36 36
√36=6
c. σ = 36, n = 144 =3

formula SE= σ
√n

#2. A sample was taken of 36 people attending a school with an annual average tuition of $3800 and the population standard deviation of $620. Find the 95% confidence interval of the true mean. 3,800+1.960 (620/√36) =4,002.5

3,800- 1.960 (620/√36)=3,597.5 I am 95% confident the # is between 4,002.5 and 3,597.5 _
formula CI= X + Z(s/√n

#3 A sample of 25 bank loan customers showed initial application times to have a mean of 22.55 minutes and a standard deviation of 3.8minutes. A) Find a 99 percent confidence interval for μ, assuming that the sample is from a normal population. B) How could the confidence interval be made narrower? 22.55+2.576 (3.8/√25)= 24.50

22.55- 2.576 (3.8/√250=20.60 I am 99% confident the #is between 24.50 and 20.60 _
Formula CI= X + Z(s/√n

#4 A prior study showed that the average ATM cash deposit took 60 seconds with a standard deviation of 12 seconds. The study is to be repeated this year. How large a sample would be needed to estimate this year’s mean with 99 percent confidence and an error of + or - 2 seconds? 60+2.576 (12)

...Business system anaylsis
Problems and Exercises
Week 5 Homework
Tom Sanders
DeVry University
Professor Girten
September 30, 2014
Problems and Exercises
Chapter 8
Question 3 - Imagine the worst possible reports from a system. What is wrong with them? List as many problems as you can. What are the consequences of such reports? What could go wrong as a result? How does the prototyping process help guard...

...Web Calculator Exercise5
ANOVAs
1. A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and Interpersonal Therapy (IT). All participants complete the weekly treatment for 8 weeks. Participants take an anger test before and after the 8-week treatments....

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*Mark is investing P5000 at 6% per annum, compounded quarterly for 3 years. Then, he will invest that amount along with some additional money at 7.25% per anum, compounded monthly for 3 more years so as to have P12500 at the end of six years. How much additional money must he invest?
-Effective Rate
*Find the effective rate equivalent to 10% compounded semi-annually.
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...GRADE 9/9
Lind Chapter 9; Exercise 12
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption.
A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
a. What is the value of the population mean? What is the best estimate of this value?
The value of population mean is unknown. The best estimate of this value is the sample mean of 60 pounds.
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Ch. 7, Practice Problem: 14
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking—even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other...

...Calculate and interpret the following for the data in Column K, “The degree of agreement among patrons that Remington’s has large portions,” on the Remington Data worksheet of the Remington’s Data Set workbook:
Mean -3.26
Standard deviation-0.911
Range -3
4
Mean
3.261306533
Standard Error
0.064596309
Median
4
Mode
4
Standard Deviation
0.911243075
Sample Variance
0.830363941
Kurtosis
-1.16899198
Skewness
-0.663704706
Range
3
Minimum
1
Maximum
4
Sum
649
Count
199
Largest(1)
4
Smallest(1)
1...

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Kanit Dararutana
Dr. Thomas Hennefer
BUS 642 – Business Research Methods & Tools
Ashford University
4 February 2013
Week 5 Assignment
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...Handwriting is important for everyone to know how to complete regardless of their age or grade level. Throughout a child’s school years they will be required to write legible handwriting. When a student’s handwriting is illegible words might be mistaken for other words or misunderstood all together. (Ogle & Beers, 2009, chapter 9 para 1). When students are writing for others to see it is important that they are instructed to write legible, they need to be told that...

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