What hypothesis testing procedure would you use in the following situations?

a) A test classifies applicants as accepted or rejected. On the basis of data on 200 applicants, we test the hypothesis that ad placement success is not related to gender.

H0: ad placement success is not related to gender. (Indep) Ha: ad placement success is related to gender. (Dep)
2-independent sample Chi-square test

b) A company manufacturers and markets automobiles in two different countries. We want to know if the gas mileage is the same for vehicles from both facilities. There are samples of 45 units from each facility.

H0: Gas mileage is the same for vehicles from both facilities. H1: Gas mileage is NOT the same for vehicles from both facilities. 2 independent sample Z test
t-test: N=30

c) A company has three categories of marketing analysts: (1) with professional qualifications but without work experience, (2) with...

...Why We Don’t “Accept” the NullHypothesis
by Keith M. Bower, M.S. and James A. Colton, M.S.
Reprinted with permission from the American Society for Quality
When performing statistical hypothesis tests such as a one-sample t-test or the AndersonDarling test for normality, an investigator will either reject or fail to reject the nullhypothesis, based upon sampled data. Frequently, results in Six Sigma projects contain
the verbiage “accept the nullhypothesis,” which implies that the nullhypothesis has been
proven true. This article discusses why such a practice is incorrect, and why this issue is
more than a matter of semantics.
Overview of Hypothesis Testing
In a statistical hypothesis test, two hypotheses are evaluated: the null (H0) and the
alternative (H1). The nullhypothesis is assumed true until proven otherwise. If the
weight of evidence leads us to believe that the nullhypothesis is highly unlikely (based
upon probability theory), then we have a statistical basis upon which we may reject the
nullhypothesis.
A common misconception is that statistical hypothesis tests are designed to select the
more likely of two hypotheses. Rather, a test will stay with the null...

...Take Home Test 2
1. A. NullHypothesis: There are no relations or associations among the groups’ mean scores.
Alternate Hypothesis: There is a relation or association among the student’s grade point averages and “if they rather prefer to stay at home than go out with friends”.
Correlations |
| Grade Point Average | I would rather stay at home and read than go out with my friends |
Grade Point Average | Pearson Correlation | 1 | .233 |
| Sig. (2-tailed) | | .120 |
| Sum of Squares and Cross-products | 12.667 | 5.002 |
| Covariance | .281 | .111 |
| N | 46 | 46 |
I would rather stay at home and read than go out with my friends | Pearson Correlation | .233 | 1 |
| Sig. (2-tailed) | .120 | |
| Sum of Squares and Cross-products | 5.002 | 36.457 |
| Covariance | .111 | .810 |
| N | 46 | 46 |
Based on the results of our Correlate Bivariate we see that the significance value is more than the p-value of .05 which means that the groups have no relationship between them. The significance value is .120. This means that we are going to accept the NullHypothesis and reject the Alternate Hypothesis. “I would rather stay at home and read than go out with my friends” has no relationship with the persons GPA.
B. NullHypothesis: There is no relation or association between people who rarely forget their appointment if they have...

...researcher desires an 80% power and a 95% confidence.
1. The determination of the sample size will be based on
a. estimation of a population mean
b. hypothesis testing between two proportions
c. estimation of a population mean
d. hypothesis testing between two means
RATIONALE: First, check muna if what they’re looking for is mean or proportions. I’m not really sure, but technique ko dyan, pag may mga decimal point, MEAN YUN. Mostly, ang mga MEAN cases ay yung mga blood pressure (systole, diastole). So in this case, you’re just comparing two drugs. Hence, proportions. Also, hypothesis palagi for sample size.
2. What is the nullhypothesis?
a. the cure rate in the new drug is not equal to the cure rate in Metronidazole
b. the cure rate in the new drug is better than the cure rate in Metronidazole
c. the cure rate in the new drug is equal to the cure rate in Metronidazole
d. the cure rate in the new drug is not better to the cure rate in Metronidazole
RATIONALE:
NullHypothesis (Ho) = no change/equal
Alternative Hypothesis (Ha) = with change/not equal
**PLEASE PLEASE PLEASE memorize!! Also, be careful with this. Always read the case first. The hypothesis will always depend on the case. Here kasi, they’re comparing the efficacy of 2 drugs to treat amoebiasis. Hence, ang NULL ay equal...

...Alyazia Juma Al Muhairi
201013709
Communication research methods (52)
NullHypothesis
The nullhypothesis, is an essential part of any research design, and is always tested, even indirectly. The 'null' often refers to the common view of something, and so the nullhypothesis (H0) is a hypothesis in which the researcher tries to disprove, reject or nullify.
Examples of theNullHypothesis
A researcher may postulate a hypothesis:
H1: Tomato plants exhibit a higher rate of growth when planted in compost rather than in soil.
And a nullhypothesis:
H0: Tomato plants do not exhibit a higher rate of growth when planted in compost rather than soil.
It is important to carefully select the wording of the null, and ensure that it is as specific as possible. For example, the researcher might postulate a nullhypothesis:
H0: Tomato plants show no difference in growth rates when planted in compost rather than soil.
There is a major flaw with this H0. If the plants actually grow more slowly in compost than in soil, an impasse is reached. H1 is not supported, but neither is H0, because there is a difference in growth rates.
If the null is rejected, with no alternative, the experiment may be invalid. This is the reason why science uses a battery of...

...areas (N = 84) hired an average of 6.80 females (s = 4.16). Using an alpha of .05, test the nullhypothesis that there is no difference between the means.
a. What is the nullhypothesis? What is the research hypothesis?
i. The nullhypothesis is that there is no difference between urban and rural jurisdictions in the hiring of female police officers last year.
ii. The researchhypothesis is that there is a difference between urban and rural jurisdictions in the hiring of female police officers last year.
b. What are the degrees of freedom?
Formula: df=N1+N2-2 Given: N1=77, N2=84
df= 77 + 84 -2
df= 159
c. What is the critical value?
i. Due to the fact that the degrees of freedom is 159 and the table goes from 100 to infinity, infinity is the closest value that can give the closest critical value being 1.96 in the two-tailed test category. Since the critical value decreases as the obtained value increases, the critical value has to be less than 1.96 which is the critical value of 100. (Page 372)
d. Do you reject or fail to reject the nullhypothesis?
Given:
Urban (Group 1): Nonurban (Group 2):
N1=77 N2=84
Mean (): 9.65 Mean (): 6.80
Standard Deviation (s1): 4.17 Standard Deviation (s2): 4.16
Variance (s12): 17.39 Variance (s22): 17.31
Formula:
Due to the critical value being 1.96 and...

...The situation calls for theory testing
3. Which of the followings is NOT a qualitative data collection?
A. Questionnaire – based survey (quantitative)
B. In-depth interview
C. Analysis of texts
D. Participant observation
4. Which format can a questionnaire – based survey take?
A. interview format
B. respondent-completing format
C. c. observation format
D. A & B
Week 7
1. Which of the following does NOT fit a qualitative approach to research?
A. Standardised
B. Open-ended
C. Iterative
D. Uses multiple sources of evidence
2. Which of the following describes qualitative research?
A. Concepts are in the form of distinct variables
B. Concepts are in the form of themes, motifs, generalisations and taxonomies
C. Tests hypothesis that the researcher begins with
D. Data are in the form of numbers or precise measurements
3. Which of the following is NOT a qualitative sampling technique?
A. Snowballing
B. Convenience
C. Theoretical
D. Random
4. Which of the following is NOT a qualitative method or approach?
A. Interviews
B. Focus groups
C. Participant observation
D. Surveys
5. What is a focus group?
A small number of individuals
6. Which of the following is NOT a quantitative method?
A. Participant observation
B. Content Analysis
C. experiments
D. questionnaires
7. What is a sample?
A subset of a population
8. Does quantitative research have to be generalizable?
A. Yes
B. No
9. What is a population in a research study?...

...Hypothesis testing using the binomial distribution
Chapter assessment
1. Sweets called “Scruffies” are sold in packets of 18.
Scruffies come in a variety of colours, and market research shows that red is the most popular. Scruffies are packed randomly, and on average 25% are red.
(i) Find the probability that a packet contains no more than 6 red Scruffies. [2]
(ii) Find the probability that a packet contains exactly 4 red Scruffies. [2]
Because of a fault in the packing machine, one packet in ten now contains 19 Scruffies instead of 18.
(iii) Find the new probability that a randomly selected packet contains exactly 4 red Scruffies. [5]
In order to increase sales, the manufacturer claims to have increased the proportion of red Scruffies. Eric decides to test the manufacturer’s claim by purchasing a packet of Scruffies. (Assume that all packets now contain 18 Scruffies.)
(iv) The packet contains 8 red Scruffies. Does this support the manufacturer’s claim at the 5% significance level? Write down your hypotheses clearly and show your working in full. [6]
2. In a national survey, it was found that 40% of young people failed a standard fitness test.
A random sample of 30 young people is taken.
(i) Explain why, for such random samples, the mean number of those who failed the fitness test is 12. [1]
(ii) Find the probability of the mean number occurring. Explain how you would check whether the mean is...

...
Hypothesis Testing Paper
Hypothesis Testing Paper
There are many reliable sources that are readily available for researching topics, whether it is for personal or professional use. Two of these sources are known as the Internet and the Yellow Pages. Based upon the test performed, to determine if the Yellow Pages will become obsolete in the near future, the following information was found based on thehypothesis and test results that have been recorded in the passage. There are many people who would prefer the use of the Internet to the Yellow Pages because of the convenience and not having to flip through pages to find what you are looking for. The Yellow Pages have become a thing of the past and is quickly being replaced by new research methods individuals can access via the Internet.
In the past twenty years the Internet has continued to grow into what we know today. In 1993 the first primitive search engine was released (Seymour, Frantsvog, & Kumar, 2011). Google became the prominent search engine around 2000 by using an algorithm to rank web pages; the desirable pages would be linked more than others based on importance (Seymour, Frantsvog, & Kumar, 2011). With the growth of the Internet and the rise of technology, there has been an increase in the number of businesses that use the Internet for marketing (Salehi, Mirzaei, Aghaei, &Abyari, 2012). Businesses use the Internet to...

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