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You are given the following statistics:
Treatment
14.5 Xr14-05 A consumer organization was concerned about the differences between the advertised sizes of containers and the actual amount of product. In a preliminary study, six packages of three different brands of margarine that are supposed to contain
Statistic
1
2
3
500 ml were measured. The differences from 500 ml
n
4
are listed here. Do these data provide sufficient evi-
x
20
22
25
dence to conclude that differences exist between the
s2 10 10 10
a. Complete the ANOVA table.
b. Repeat part (a) changing the variances to 25 each.
c. Describe the effect on the F-statistic of increasing the sample variances.
The data studies the effect of dietary calcium on blood pressure. In the experiment, one group of black male adults received calcium supplements for 12 weeks.
A recent national survey found that high school students watched an average (mean) of 6.8 videos per month. A random sample of 36 college students revealed that the mean number of videos watched last month was 6.2
Conduct an appropriate t-test using these data. Based on your results, it is reasonable to conclude that future students would show higher scores after instruction? Why or why not? Calculate the effect size as well as a confidence interval for the ..
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
find the value of the linear correlation coefficient r. x 22.6 36.6 15.6 35.0 47.5 y 7 6 6 2 6 a 0 b -0.478 c
Suppose that each player acts independently of the other. If each player decides to hold up the same number of fingers that he guesses his opponent will hold up, and if each player is equally likely to hold up 1 or 2 fingers, what are the possible..
an april 15 2002 report in time magazine stated that the average age for women to marry in the u.s. is now 24 years of
Serena Williams made a successful first serve 67% of the time in a Wimbledon finals match against her sister Venus. If she continues to serve at the same rate the next time they play and serves 6 times in the first game, determine the following pr..
The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds.
recently a company tested three different machine types to see if there was a difference in the mean thickness of
1. Given a population where the proportion of items with a desired attribute is p = 0.25, if a sample of 400 is taken,
laboratory animals were reared under three different conditions. the animals were randomly assigned to each group. the
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