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Q1) IQ scores are normally distributed with the mean of 100 points and standard deviation of 15 points. If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
a) True
b) False
Q2) Heighst of adult males are normally distributed with the mean of 69 inches and standard deviation of 2.8 inches.
a) Group of 225 adult males is chosen at random, determine the probability that their mean height is between 68 inches and 70 inches.
b) Group of 121 adult males is chosen at random; determine probability that their mean height is 72 inches or more.
c) Group of 417 adult males is chosen at random, determine the probability that their mean height is between 67.5 inches and 68.5 inches.
d) Group of 600 males is chosen at random, determine the probability that their mean height is between 68.7 inches and 69.3 inches.
Labor negotiations estimate that 30 percent of all major contract negotiations result in a strike. During the next year, 12 major contracts must be negotiated. Determine the following probabilities.
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
The following table shows the number of miles driven in each trial.
Professor Cox needs a volunteer amongst 30 students in his statistical applications course. The average age of his students is 25 years, with the standard deviation of 3 years.
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
Is there a significant difference between the scores between the Republicans and the Democrats?
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A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
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