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Testing for equality of mean.
1. A computer is programmed to make 100 draws at random with replacement from the box (0,0,0,0,1), and take their sum. It does this 144 times; the average of the 144 sums is 21.13. The program is working fine. Or is it?Working fine Something is wrongChoose one option, and explain your reason.
2. (Hypothetical.) Is Wheaties a power breakfast? A study is done in an elementary statistics class; 499 students are free to participate. After the midterm, 250 are randomized to the treatment group, and 249 to the control group. The treatment group is fed Wheaties for breakfast 7 days a week. The control group gets Sugar Pops.
a) Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
b) What aspects of the study could have been done "blind"
Describe what you find then produce an ANOVA for the problem.
Test whether race and NATFAE are independent (α = 0.05). What do you conclude?
Calculate the Measures of Center and Measures of Variation for the following data set representing the chest size of 20 bears in inches.
An advantage of the permutation test over the t test for a difference in means is that - distribution interval or a bootstrap percentile interval
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
The following data represent the cost of electricity for the period of July 2008 for a random sample of 50 one-bedroom apartments in a large city.
Compute the suitable Test Statistic to test hypothesis that the proportion of condominiums that sold within 30 days decreased from 2006 to 2007.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
Carry out the suitable calculations to test for effect modification. Interpret your results.
what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 percent reliability.
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
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