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Find the probability that a standard normal random variable will assume a value between:
a. z = 1.5 and z = .75
b. Greater than 1.25
c. Find a z such that 70% of the area is above that value.
Average Precipitation For the first 7 months of the year, the average precipitation in Toledo, Ohio, is 19.32 inches. If the average precipitation is normally distributed with a standard deviation of 2.44 inches, find these probabilities.
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
If there are repeated independent trials and there are only two outcomes, what distribution should be used?
As sample size increases, the standard error of M _______________ .
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
Mean=63.6 Standard deviation=2.5 If 36 data points are arbitrarily chosen, determine the probability that mean is less than 64.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
What is the real world value of the y-intercept and slope in a regression equation? Other than statistics problems, why should I care?
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
A Gallup Poll (June 9 to 12, 2008) interviewed a random sample of 822 adults (18 years or older). The people in the sample were asked about their level of confidence in a variety of institutions in the United States. Here are the results for small..
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