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a) Under what circumstances can z be greater than one?
b) Under what circumstances can a probability be greater than one?
c) Under what circumstances can z be negative?
d) Under what circumstances can a probability be negative?
N=120, population standard deviation is (known) 5, alpha =.05, standard error of the mean (sigma of xbar)= .46, h0 is rejected if xbar
Test the claim that the Snickers bars have a mean weight that is different than 20.1 grams. Because shutting down the plant is very expensive, test the claim at the .01 level of significance.
Give a mathematical expression for the probability density function of driving distance.
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
Suppose you roll a standard die 2000 times and let X be the sum of the values you get. Using the Central Limit Theorem, for what value of a is P[X >= a] approximately equal to P[N(0,1) >= 2] ?
Computing the probability values using normal distribution - what proportion of licensed drivers are less than 30 years old?
The annual precipitation amounts in certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches.
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
Based on a study of heights of men and women who do gymnastics, a researcher concludes that the exercise from playing gymnastics causes people to become shorter. Do you agree with this conclusion?
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Supposing that both tests measure the same kind of ability, who has the higher score? If grading were done on a curve, what would their respective percentages be?
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