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A new drug is claimed to have effect on reducing heart rate for patients with unstable angina by 15 beats per minute over 24 hours. Suppose heart rate(beat per minute) of population follows a normal distribution with standard deviation 25(based on previous experience). At significance level alpha=.05, how many patients should be enrolled in the study so that the test power is guaranteed being 80% at least.
Please show the handwork, not just a statistical output.
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Finding the probability of each event in a group of events of different possibility
Whats the most appropriate procedure for evaluating the relationship between tenure and divorce and what is the correlation and how can it be interpreted in terms of magnitude, direction and practical importance?
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model.
Calculate an 85% confidence interval for the population mean number of wolf pups per den at southwestern United States (US).
Find out sample standard deviation (s) of scores Gordon Golfer made on his last four rounds (determine to the nearest one tenth, or .1).
How would you explain to another student the difference between compound interest and continuous compound interest to a friend?
What does confidence interval tell you? What does it mean? What 2 things can a researcher do to decrease width of a confidence interval? What are the effects?
Ethnic Group A: N = 15 M= 55 S2 = 6.5 Ethnic Group B : N = 23 M= 51 S2 = 4.5. If the standard deviation of the distribution of the difference between means is .76, what is the t score?
Why is effective sampling important when performing a hypothesis test? What could happen if your sample is not appropriate to your study?
A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6. A raw score of 47 is associated with what percentile?
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