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Two years ago, a survey of all Wal-Mart customers indicated that the mean number of items bought per day by male customers was 8.3 with a standard deviation of 3.7. You wish to determine whether or not shopping habits among males have changed over the 2-year period.
The following results for the men from a recently selected random sample of customers (in items bought per day): Mean = 7.7, n = 108.
a) Set up H sub 0 and H sub A (null hypothesis and alternative hypothesis).
b) Perform the statistical test (? = .05).
c) Draw final conclusions.
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
A pharmaceutical company conducted study to evaluate the effectiveness and safety of new inhaled form of insulin for treatment of diabetes. A group of 650 diabetics was given the drug twice a day, while another group of 650 diabetics was given an ..
What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..
Could you please explain in words how you figure out deciles, quartiles, kurtosis, skewness in Excel? How do you find the sum count, largest, and smallest in Excel?
Give the 90% confidence interval for the mean score in the population of all young women.
The sample mean of the accounts is found to be y-bar = $94.22, and the sample variance is equal to $455.21. Estimate mu and place a bound on the error of estimation.
Doctors nationally believe that 68% of a certain type of operation are successful. In a particular hospital 47 of these operations were observed and 37 of them were successful. At a = 0.05 is this hospital's success rate different from the nationa..
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
Provide an example from your work or home life; illustrate the difference between the application of descriptive statistics and inferential statistics.
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