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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 proportionsC) One sample z-test for the population proportionD) Two independent sample t-test for the differences between two population meansE) One sample t-test for the populationF) Two sample F-test for the ratio of population variances
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
Describe the given data show a seasonal effect using moving average method. Describe the data which show a seasonal effect.
The results of a survey for an airline are shown below. Use the chart to find the probability that the traveler was
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
Conduct a hypothesis test at the 6% level of significance to determine whether there is evidence that the true mean fill volume for all jugs of softener differs from 120 ounces.
The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
Compute cumulative probabilities for these numbers in second column. Then create a histogram illustrating data distribution. Using generated Normal probability table, determine probability of Pr(X
Would you conclude that your data set is approximately normal? If so, what percentage of your data values lie:
Customer's arrive at See's Candy Store at a rate of 2 every 5 minutes. What is the probability that no customers will arrive in a 5 minute period?
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
In a simple linear regression analysis of 18 data points the following ANOVA table was found.
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