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Hypothesis Testing

Hypothesis testing problems in SPSS


Statistics: Large school district analysis of recent curriculum experiments


Null Hypothesis Testing


True or False Questions & Hypothesis Testing


Applied Statistics for Health care


Hypothesis Testing: Sensory Discrimination




Applied Statistics for Health Care


Applied Statistics for Health Care


Hypothesis Testing Problems for University Sexism


PB 7.9 Rank of birth and age at oncet (Biostatistics)


Question about Applied Statistics Health Care


A fictional statistical representation of school lunch programs


Distribution of IQ Scores


Case Study Data Analysis



Null Hypothesis and Alt Hypothesis

At a college, two professors, Saber and Tooth, are each teaching large sections of introductory statistics with 500 students in each section. They decide to compare the results from their first exam. It would be too cumbersome to compare all 1000 students, so the decide to select a random sample of 50 students from each section.


1. Sandy's Pizza has generally assumed that the mean age of its customers was 30 years of age or younger. A random sample of 50 customers revealed the following: X-bar=30.76 years and s=3.6 years Does the sample data provide sufficient evidence to conclude that the mean age of Sandy's customers is greater than 30 years

3 Null and alternative hypotheses questions

In hypothesis testing, the null hypothesis is tested and a decision is made as to whether to reject or not reject the null hypothesis. Then the conclusion must be stated in terms of the problem being studied. Determining the null and alternate hypotheses sometimes presents problems for students. This discussion activity will giv

Hypothesis Testing of Mean Recent Reports

a recent news report indicates that the mean (Ã?µ) number of years that first-time drug offenders are sentenced is 10.65. The sample of 31 court records from your county indicated a mean number of years = 12.22 with a standard deviation of 3.26. Assume you are working at the .05 level of significance A)State the appropriate n

State an appropriate null hypothesis

See attached files. A researcher would like to determine whether humidity can have an effect on eating behavior. It is known that under regular circumstances, laboratory rats eat an average of µ = 10 grams of food each day. The researcher selects a random sample of n=15 rats and places them in a controlled atmosphere room

Hypothesis Testing and Confidence Intervals

Your manager has speculated the following: a. the average (mean) annual income was less than $50,000, b. the true population proportion of customers who live in an urban area exceeds 40%, c. the average (mean) number of years lived in the current home is less than 13 years, d. the average (mean) credit balance for suburban c

Hypothesis Testing II: One Sample Hypothesis Tests

See the attached file. 1. Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the random sample of 65 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XY

Five Step Hypothesis Test

Perform a 5 step hypothesis test on the given data for the following null and alternative hypothesis: Null Hypothesis - TB is greater in the U.S. than foreign countries between 1993-2009 Alternative Hypothesis - TB is less in the U.S. than in foreign countries between 1993-2009. See the attached files.

Hypothesis Test

1. We ask if the attitudes toward fuel cost of 100 owners are hybrid electric cars (X=76) are different from those on a national survey of owners of non-hybrid cars (µ=65, s=24). Higher scores indicate a more positive attitude. A) Is this a one or two tailed test? B) In words what is the H0 and Ha? C) Perform the z-test.