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X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
A) p(z<78.0)
B) p(75.0<X<85.0)
C) p(x>86.0)
a) Draw the scatter diagram. Does it appear that x and y are related? If so, how? b) Test to determine whether there is evidence of a linear relationship.
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
Calculate the z - scores for the three samples, compare the z score to the t-statistic, is the null hypothesis accepted or rejected?
University officials at a major university would like to use three -term moving averages to examine enrollment. Enrollment data (in thousands of students) for the 12 most recent terms are shown in middle column of the table below.
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
Using the data for women, complete an analysis of CHD incidence in women similar to the one completed for men.
A roulette wheel has 38 slots, numbered 0, 00, and 1 to 36. The slots 0 and 00 are colored green, 18 of the others are red, and 18 are black.
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?
Calculate the value of Pearson correlation. Illustrate what information is provided by the numerical value of the Pearson correlation.
Use the .05 significance level and the 5 step hypothesis testing process to check if there is a difference in the mean flight times among the three airlines.
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