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Out of a sample of 1078 Americans, only 507 said they thought the earth is getting warmer due to human activities. Do these data provide sufficient evidence at the 0.05 level of significance to conclude that only a minority of Americans believe the earth is getting warmer due to human activities?
a. What are the H0 and H1? What is the test statistic?
b. What is the sampling distribution of p?
c. What is the P-Value?
d. State the conclusion in terms of this problem.
If a pet store wishes to determine the level of customer satisfaction with its services, would it be appropriate to conduct an experiment? Explain.
Suppose we have observations x1, x2, . . . , xn. Prove that the sum of deviations of the observations from their arithmetic mean is always equal to zero.
If random sample of 121 current stockholders is taken, what is the probability that 23% to 26% of these stockholders will find offer teams attractive?
A hotel chain is interested in evaluating reservation processes. Guests can reserve a room by using either a telephone system or an online system that is accessed through the hotel's web site.
For this example, what specific test might you use to test whether the average number of offspring has changed over the years? Why would you use this specific type of test? Describe a brief scenario where you may need to use nonparametric statistic..
Assume the number of gallons sold follows the normal distribution with a population standard deviation of 5.10 gallons. A random sample of 60 days shows that the mean daily number of gallons sold is 10.00. What is the point estimate of the populat..
Find the mean, range, variance, and standard deviation for each of the three variables shown in the list. Present your results in a table. Using your results from (a), compare the distributions for job growth percentage and Percentage of women empl..
The president of the wholesale distributor is concerned about the possibility of stockouts causing a loss of customer confidence and loyalty and is interested in maintaining safety stock in inventory to prevent potential stockouts.
If the mean (Mu) diastolic blood pressure in a certain age group is 80, and the standard deviation (Sigma) is 10, what is the probability that, in a sample of 100, the sample mean (X) is > 85?
Management at the Kansas City Corporate office for tax prepration wants to accomplish a business objective by conduting a study of the waiting time in its tax offices in different states.
Be certain to mention what inferential statistics is and why we use it, what is random sampling, which is statistical significance and why we test it.
most major airlines allow passengers to carry two pieces of luggage of a certain maximum size onto the plane. however
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