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Set 1:
1. Given the mean equals to 33.1, and s = 1.56, compute the 99 percent and 90 percent confidence intervals for sample size n = 121.
2. Use one example to explain the differences between Type I error and Type II error and their relationship to the power of a statistical test
Set 2:
You wish to compare the short-term effects between two new sleep-aid drugs. You try the two drugs in a sample of eight subjects with five days between the two tests. The following data gives the number of hours during the night under each drug.
Subject
Drug A
Drug B
1
6
5
2
3
4
7
8
1. If you want to know if the two drugs have similar or different effects, what is the appropriate analysis?
A. An independent-samples T-test
B. A paired-samples T-test
2. Run the appropriate analysis using α = .05 and report your results.
The number of students that enroll in a psychology course is a poisson random variable with mean 100.the course incharge has decided that if the enrolling is 120 or more he will teach the course in two separate sections.
a researcher is interested in the effect of st. johns wort on memory. a group of 25 college students is selected to
Recognize the given samples are independent samples or matched pairs.
A researcher wants to create a 99% confidence interval for the population mean. He has a sample of n=120, an x-bar of $340, and a sample standard deviation of $122. What is the margin of error?
What is the probability that a single randomly selected juror from Hidalgo County is Mexican-American? Explain briefly. What is the probability a single randomly selected juror is not Mexican-American? Explain briefly.
The data (in milliamps) are shown below. Using the .05 level of significance, are there any differences in the three categories.
Briefly discuss probability distributions. What is a normal distribution? Please provide a written example of how 'understanding distribution' can be an asset for any business project.
stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed. What type of sampling should you do? Why?
A recently installed assembly line has problems with intermittent breakdowns. Recently, it seems that the equipment fails at some point during 15% of the eight-hour shifts that the plant operates. Each day contains three consecutive shifts. State ..
if 100 tires are randomly selected for shipment to an outlet, what is the probability that they are all good? should this outlet plan to deal with defective tires returned by consumers?
a sample of 210 bell computers has 56 defectives. theory suggests that a third of all bell computers should be
Identify the steps in interpreting a regression model. Interpret the following data: Y = 5.0 + .30X1 where the dependent variable equals turnover intentions for line managers and the independent variable equals the number of employees supervised
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