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Five subjects' IQ scores were measured before taking a "smarticle pill" and after. The following were the results:
IQ Before IQ After
105.2 114.3
114.86 117.0
71.64 93.7
76.16 97.2
83.61 90.0
a) Using the paired t-test, is there a significant difference between the before and after scores? Use the p-value method:
b) Now use the pooled t-test for independent samples to test whether there is a significant difference between the mean of the two columns. Assume equal variances and use the p-value method:
c) Compare the two outcomes. You should have rejected the hypotheses in one method and failed to reject the null hypothesis in the other. Obviously, these are two different conclusions and only one of them is correct. Which method and conclusion is correct and why?
1 if we are very certain that the true standard deviation of the number of defects per screen is below 2 what sample
Chronic tension headaches. Doctors identify "chronic tension-type headaches" as headaches that occur almost daily for at least six months.
The employees of a company were surveyed on questions regarding their educational background and marital status. Of the 600 employees
Second loan. Exercise describes the loan score method a bank uses to decide which applicants it will lend money. Only if the total points awarded for various.
What is the probability that there will be a stock out? Given that you, the maintenance officer at the facility, want the probability of a stock out to be no more than 5% what should the reorder point be?
data were collected on gpa and number of faceook friends for students in a small statistics class. some summary
Find the probability that the investor makes money and receive a dividend.
Carolina Inc. is deciding whether to buy or lease a piece of equipment. Analyst estimated the CFs associated with both options.
a poll was conducted that asked 1015 people how many books they had read in the past year. x13.3 books and s16.6 books
Now analyze the data in the proper way. Compute the sample mean and variance of the differences. Describe the differences in the two test results
Best countries for business. Figure 4.5 (page 164) gives a scatterplot of the gross domestic product per capita versus the unemployment rate for 99 countries.
What is the difference between primary and secondary market data? What are the advantages and disadvantages of each?
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