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The 49 students in a class made blinded evaluations on pairs of cola drinks. For the 49 comparisons of Coke and Pepsi, Coke was preferred 29 times. Researchers want to know : in the populations that this sample represents, is there strong evidence that a majority prefers one of the two drinks?
a) Define the parameter of interest, state the null and alternative hypotheses corresponding to the researchers' questions.
b) Compute the test statistics corresponding to the hypothesis
c) Compute the p-value and interpret in terms of the researchers' questions.
d) compute the 99% confidence interval for the true value of p, the proportion of students who prefer Coke. Interpret the interval in context of the problem.
e) What information does the confidence interval give you that the hypothesis test does not?
A manufacturer produces and sells chilled, ready-to-eat pasta salad in round lots of 50 serving units each. These items have a very limited shelf life; therefore, if items are made but not sold, they have no value.
Students given exam with 300 multiple questions, distribution was normal and mean 195 with a standard deviation of 30. What were the scores of the students who are within one standard deviation of the mean?
Find the probability (type answer as an integer or simplified fraction) of a couple having a baby boy when their fifth child is born, given that the first four children were all boys.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
Each day the major stock markets have a group of leading gainers in price (stocks that go up the most). On one day the standard deviation in the percent change for a sample of 10 NASDAQ leading gainers was 15.8.
when circuit boards used in the manufacture of compact disc players are tested the long-run percentage of defectives is
As a public health personnel, you conducted a survey and collected economic and health data on households in a township that is known to have a high prevalence of heart disease.
Analyze the residuals of the regression model identified in using formal hypothesis test, check the adequacy of your regression model.
Identify the null hypothesis, alternative hypothesis, test statistic, Critical Values, conclusion about the null hypothesis, and final conclusion that addresses the original claim.
The number of degrees of freedom associated with the t test, when the data are gathered from a matched pairs experiment with 13 pairs, is:
Past experience indicates that an average number of 6 customers per hour stop for gasoline at a gasoline pump. What is the probability of 3 customers stopping in any hour?
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