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A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence. Z-test for Unpaired data
a. Is it a 1 or 2 tail testb. Compute the statistical calculationc. What is your decision regarding H1d. What is the P-value
A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute. A sample of 40 users had an average pulse rate of 98 beats per minute. Find the 95% confidence interv..
Explain why a strong correlation would be found between weekly sales of firewood and weekly sales of cough drops over a 1-year period. Does the strong correlation mean that one variable causes the other?
A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion.
If there are 75 baskets of tomatoes available to be sold at the roadside stand at the beginning of a day, what is the probability that they will all be sold by the end of the day?
A standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be greater than 122.
Find the probability that in a given year a) exactly one major hurricane will strike the U.S. mainland, b) at most one major hurricane will strike the U.S. mainland.
In a sample of 50 members of a local health club you find that 12 of these members meet weekly with a physical fitness trainer and that the average body mass index (BMI) of these 12 members is less than the average BMI of the other 38 club members..
In a normal frequency distribution, 32% of the cases:
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
You are one space short of winning a child's board game and must roll a 1 dice to claim victory. You want to know how many rolls it might take. Describe how you would simulate rolling the dice until you get 1.
The amount of money spent by a customer is uniformly distributed over (0, 100). Find the mean and variance of the amount of money that the store takes in on a given day.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
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