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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
Consider the experiment of throwing an ideal die three times(all outcomes are equally likely). Let X and M denote the mean and the median respectively, of the three scores obtained.
Their resting heart rates were measured. A partial ANOVA table is given.
Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
If the true mean for Saturday sales is now $4500, what is the probability of accepting the (false) null hypothesis.
The owner of the Burger Doodle Resturant is considering two ways to expand operation: open a drive-up window or serve breakfast. Th increase in profits reulting from theise proposed expansions depend on weather a competitor opens franchise down th..
Calculate the correlation and the regression equation and plot the data in the space provided.
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
Can researcher conclude that humidity has significant effect on eating behaviour? Use two-tailed test with a = 0.05.
Suppose the people have weights that are normally distributed with a mean of 164lb and a standard deviation of 30lb. Find the probability?
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
The rate of defects among CD players of a certain brand is 1.1%. Use the Poisson approximation to the binomial distribution to find the probability that among 240 such CD players received by a store, there is at most one defective CD player.
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
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