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Complete the full confidence interval procedure for each of the following.
Problem
A college administrator would like to determine how much time students spend on homework assignments during a typical week. A questionnaire is sent to a random sample of n =100 students and their response indicates a mean of 7.4 hours per week. The population standarddeviation is known to be 3 hours. Construct a 95% confidence intervalfor the population mean of the number of hours student spend on homework during a typicalweek.
In Roosevelt National Forest, the rangers took random samples of live aspen trees and measured the base circumferenceof each tree. Assume that the circumferences of the trees are normally distributed.The average of the 100 trees sampled was 15.71. The population standard deviation is 4.63 inches. Construct a 90% confidence interval for the population mean of the circumference of the aspen tree.
The number of hours shoppers spend at Wegman's is normally distributed. A random sample of 25 shoppers has a sample mean of 42 minutes. The population standard deviation is 12 minutes. Construct a 99% confidence interval for the population mean of the time shoppers spend at Wegmans.
mean is 100 and sd is 16. doug has an iq of 76. what proportion of people have a higher iq than
Group together the designs that have an independent variable with two levels.- Paired t test- Independent t test.
Explain the difference between the standard deviation of the sampling distribution of the mean and the standard error of the mean.
An aptitude test has a mean score of 80 and a standard deviation of 5. The population of scores is normally distributed What raw score corresponds
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
Find a 99% confidence interval for the true mean weight of these snails.- Using your answer in part (a), is there is any evidence to suggest that the population mean weight is more than 20 grams?
to compare commuting times in various locations independent random samples were obtained from the six cities presented
Assuming this is literally true, how can it be explained? What facts / statistics would you need to know to expose this misleading claim?
Suppose that a company produces three different products. The sales for each product are independent of the sales for the others. The information for these products is given below:
What is the average size of a city in the country? (This is the arithmetic mean of the populations of the cities, and is also the expected value)
A player rolls a pair of dice five times. She scores a "hit" on any throw if she gets a 6 or 7. She wins iff she scores an odd number of hits.
question an fbo a fixed-base-operator usually the manager of a small-town airport makes his revenue in three ways
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