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Assume the distribution of heights among all 15 year old boys is normally distributed with mean 67 and standard deviation 3.19. Imagine a basketball team comprised of thirteen 15 year old boys, the average height of this team is 69.5 inches.
a) Calculate the z-score for the average height of this team.
b) What is the porbability of a randomly selected team whose average height will be higher than 69.5 inches?
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
msa computer corporation manufactures two models of minicomputers the alpha 4 and beta 5. the firm employs 5
Furthermore, assume that the standard deviation of the population is $0.14. The value of the test statistic for this hypothesis test and the p-value respectively are?
To determine if there is a relationship between grade performance and extracurricular participation, North Carolina state conducted a study of 112 students, recording the number of students in each of three extra-curricular categories, and each of..
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Ten bolts were selected randomly from a production line and the diameter of each was measured. Why do these diameters not have a binomial distribution?
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
Which of the following assumptions is not made for the F-test for comparing three or more means?
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
A decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 67%.
State a type I error and describe why it happens. Describe the factor that researcher can control to change type I error. Also, describe how type I errors can be avoided.
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