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Below are commute times and amounts of rainfall for a few randomly selected dates last year.
Rain (mm) Commute time (min)
3 20
0 10
1 25
9 30
15 60
12 25
Treat "Rain" as the X variable
Compute the value of r for the correlation between amount of rain and commute time.
We like to determine the current percentage of households using e-mail. How many households must be surveyed to be 90% confident that the sample percentage.
Margin of error for the predicted response. Refer to given Example. What is the 95% margin of error of when x = 9.0? Would you expect the 95% margin of error to be larger, smaller, or the same for x = 10.0? Explain.
james teaches a class of 300 students and only 6 have done their homework assignment which is due today. he calls on a
The frequency distribution below was constructed from data collected from a group of 25 students. Construct a relative frequency distribution.
What is the probability that the average number of residents within five miles of each store in a sample of 50 stores will be more
According to USA Today, 32% of the public think that credit cards are safer than debit cards, while 19% believe that debit cards are safer than credit cards.
The Tycron Company produces three electrical products-clocks, radios, and toasters
Last year a company began a program to compensate its employees for unused sick days, paying each employee a bonus of one
Two measures of center are marked on the density curve shown. Which of the following is correct?
Regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6. At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
Science News (25 February 1995, p. 124) reported a study of 232 people, aged 55 or over, who had heart surgery. The patients were asked whether their religious.
Suppose we specifically wish to compare women who used cod liver oil for the entire year during childhood vs. women who never used it. (i) Perform this comparison using the LSD method, and report a p-value.
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