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A researcher selects a random sample of college students and measures the number of hours they spend watching television per week and their grade point average. The results are as follows:
X
Y
Subject #
TV hours
GPA
1
50
1.90
2
20
2.20
3
19
2.40
4
10
3.30
5
7
2.90
6
15
2.50
3.50
8
40
1.95
9
30
2.00
3.90
Calculate the correlation coefficient and prediction equation.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
Support colour-coding on packaged food to indicate healthier options
Test whether there is a statistical difference between the two proportions at the 5% significance level.
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
Use the binomial distribution formula to calculate the probability that:
A Cornell university study of wage differentials between men and women reported that one of the reasons wages for men are higher than wages for women is that men tend to more years of work experience than women. Suppose the following results were ..
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
Find out the p-value associated with test of hypothesis you conducted?
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