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To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of69.3with a standard deviation of 24.9. Is this a significant difference at @ = .05? (a) Ste the hypotheses for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret results. (c) Is the difference in mean scores large enough to be important? (d) Is it reasonable to assume equal variances? (e) Carry out a formal test for equal variances at @=.05, showing all steps clearly.
Scores are whole values. The top 3% receive $500.00. what is the minimum score you would need to receive this award?
Compute the test statistic for the goodness of fit test. At 95% confidence using the p-value approach, test the hypotheses. What do you conclude about the distribution?
A basketball player shoots 8 free throws during a game. If we assume that each attempt has the same probability of success, the sample space for the number of baskets he/she makes during the game is ??
The table given below shows numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status. Determine the probability that they are overweight?
Fixed costs of $9,200 per month and variable costs of 70 cents per unit produced. Each item is sold to retailers at a price that averages 90 cents.
ifteen watch springs are selected from the production line and measured; their weights are 8, 3, 4, 8, 1, 4, 4, 9, 9, 2, 8, 4, 9, 7, and 7 grams. Assume = 0.01.Determine which test statistic is appropriate (chi-square or F), and calculate its value..
Five percent of the respondents gave $25,000 or more to charity over the previous year. Develop a 95% confidence interval for the proportion who gave $25,000 or more to charity.
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
Find values for the mean and variance of X. Using a distribution approximation, calculate the probability that there are more than 10 faulty disks in a box of 500 disks.
He stuffs each letter into one of the preaddressed envelopes and seals them. What is the probability that each letter is in the correct envelope?
If the analyst finds evidence that the boast of dealership A is correct. What will be your critical value? What is the value of the test statistic? the boast of dealership A is correct?
A sample of scores on an examination given to both males and females is: At the .01 level of significance, is the mean grade of the female students higher than that of the males?
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