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For each of the following scenarios, identify the inference test that should be used to answer the question described.
Creative Good, a New York consulting firm, claimed that 39% of shoppers fail in their attempts to purchase merchandise online because Web sites are too complex (Forbes, Dec. 13, 1999). Another consulting firm asked a random sample of 60 online shoppers to each test a different randomly selected e-commerce Web site. Only 15 reported sufficient frustration with their sites to deter making a purchase. Do these data provide sufficient evidence to reject the claim made by Creative Good?
A) Two sample paired t-test
B) Two sample z-test for the difference between two population proportions
C) One sample z-test for the population proportion
D) Two independent sample t-test for the differences between two population means
E) One sample t-test for the population
F) Two sample F-test for the ratio of population variances
A question has these possible choices - excellent, very good, good, fair, and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results?
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
Construct a 95% confidence interval estimate for the proportion of all workers who did not use the Internet within limits. Explain your findings so that your non-quantitative partner will understand them.
Supposing that both populations are normally distributed, construct a 99% confidence interval for the ratio of the two population variances.
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
The largest value in a set of data is 160, and the smallest value is 70. If the resulting frequency distribution is to have six classes of equal width, what will be the class interval?
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
Which of the following would be most helpful in assessing the practical significance of a test of hypotheses about a proportion?
It could not do anything with the airport and suffer a loss of revenue. The current value of raised revenue from a new airport is in question.
Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic, P-value, critical value(s), and state the final conclusion.
Does all statistical data have a mean, median, or mode? Why? When is the mean the best measure of central tendency? When is the median the best measure of central tendency?
Assume that preparation D was a placebo. Use the Scheffe's procedure to compare the average response of A, B, C, and E to the response for D.
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