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An elementary school principal would like to know how many hours the students spend watching TV each day. A sample of n = 25 children is selected, and a survey is sent to each child's parents. The results indicate an average of M = 3.1 hours per day with a standard deviation of s = 3.0.
a. Make a point estimate of the mean number of hours of TV per day for the population of elementary school children.
b. Make an interval estimate of the mean so that you are 90% confident that the true mean is in your interval.
Illustrate what can we say about the probability distribution. Is it approximately normal, elucidate the mean and standard deviation.
An independent researcher has decided to study variations in TV viewing habits among three American cities. She has managed to randomly sample households in Chicago, Atlanta, and Minneapolis and gather data on the daily "on" times for households o..
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The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
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Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
Examine the behaviour of 99% critical values for these degrees of freedom, and comment on the limits in this case.
In comparing the two variances below, what is the test value and what are the degrees of freedom that should be used?
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An exam consists of 10 true or false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly six questions correctly? (Round the answer to three decimal places)
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