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Find the test statistic, p-value and critical value and state a final conclusion.
Caim: The mean IQ score of statistics professors is less than 120
sample data: n=40, mean of the values in a sample = 117, assume that the standard deviation = 14 and the significance level = 0.05
Calculate the test statistic ( round to nearest hundredth)
Find the P-value round to 4 decimal places as needed
Find the critical value, (round to nearest thousandth as needed)
choose one
a. there is sufficient evidence to support the claim
or
b. There is insufficient evidence to support the claim
The weights of the 100 boys in the Boy Scout Troop 829 are normally distributed with a mean of 170 pounds and a standard deviation of 5 pounds.
Say, for example, the correlation is 0.75 between Height (measured in inches) and Weight (measured in pounds). If Height were changed to being measured in centimeters (where 1 inch = 2.54 centimeters) what effect would this have on the correlation..
Pick a random sample of 50 homes from the enclosed 90 cases. Double the asking price and selling price and use this data to develop three predictive models:
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
For what value of t will the null hypothesis not be rejected?
What is the value of the sample test statistic? (Test the difference p1 - p2. Do not use rounded values. Round your final answer to two decimal places.)
Median can be a more suitable measure of central tendency than mean if distribution of data is extremely skewed.
Find the probability that in a given month:
Standardize the value according to the given average and SD - unstandardize the value according to the given average and SD
At α = .01, did yellow fire trucks have a considerably lower accident rate? Determine sample proportions and z test statistic.
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30. (a) What is the probability that all the hotel's room will be rented?
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