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Test whether the mean weight is less than 10 pounds. Use P-value approach.
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
Find the probability that 4 of the 5 committee members belong to a union.Find the probability using hypergeometric distribution.
Test whether there is difference in the proportion of viewers using Chi square test.
Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours. A random sample of four students was taken in order to estimate the mean study time for the population of all students.
Name three elements of the inferential statistical analysis.
The mean maximum oxygen uptake for elite athletes has been found to be 80 with a standard deviation of 8.1. Assume that the distribution is approximately normal.
Is there a significant difference the four testing conditions?
If we select a crew member at random, what is the probability the crew member earns:
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