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The SAT scores of students are normally distributed with a mean of 950 and a standard deviation of 200
a. Nancy Bright's SAT score was 1390. What percentage of students have scores more than Nancy Bright?b. What percentage of students score between 1100 and 1200?c. What are the minimum and the maximum values of the middle 87.4% of the scores?d. There were 165 students who scored above 1432. How many students took the SAT?
The average price of a personal computer is 949 assuming that the prices are normally distributed with a standard deviation of 100 what is the price that corresponds to the least expensive 10%.
The 97.5% CI for mean changes in Group B minus mean change in Group A is (-4.7 to -0.9). Suppose we want to compute a two-sided p-value to compare the two groups.
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? That is, does the average cycle length under these conditions differ significantly from 24 hours?
What sample size would be needed to estimate he population mean to within one-half standard deviation with 95% confidence?
The chamber of commerce of a Florida Gulf Coast community advertises that area residential property is available at a mean cost of $125,000 or less per lot.
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1%.
One box contains five red and six black marbles. A second box contains 10 red and five black marbles. One marble is drawn from box 1 and placed in box 2.
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census.
What is the expected shape of the distribution of the sample mean?
What is the critical value of the Chi-square? Compute the value of Chi-square. What is your decision regarding H0?
Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
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