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Your population mean has always been 9 customers per hour. The sample standard deviation is 4. The sample size is 25. The sample mean is 8. .05 is your level of significance. Use your sample data to test the claim that the number of customers you are serving per hour has changed. Choose the most accurate answer to running this hypothesis test.
a. Your test statistic returns a number less than -2.0
b. You will reject the null hypothesis
c. Your n is 8
d. A and B
e. None of the above
Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category.
Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
The analysis needs to be re-run adding the error into the regression sum of squares.
British scientists have developed a 15 minute brain scan they hope could be used to detect autism in children. Autism and related disorders affect up to 7 out of every 1000 individuals.
What is the probability that at least three students choose Supreme Chocolate?
Pretend you are in charge of a packaging equipment company that is filling boxes of cereal. From past experience we know the population's mean weight of the filled boxes is 300 grams (and we know the distribution of grams is approximately normal).
Which of the following statements is true regarding a nonparametric test?
Heights are sampled of kids from three schools. Using a 0.05 significance level, if when looking at ANOVA results, your p-value is 0.04, what can you say about your sample data? No minimum word count.
What is the probability that a consumer buys a can whose contents are actually less than the stated weight of 16 oz.?
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.)
Find out the coefficient of determination, r 2 , and interpret its meaning.
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