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Solve x^2 = -2 where x is a real number.
Simplify your answer as much as possible.
(If there is more than one solution, separate them with commas.)
Determine the sample size necessary under the following conditions. To estimate with = 44, E = 3, and 95% confidence. To estimate with a range of values from 20 to 88 with E = 2 and 90% confidence.
A certain airplane has two independent alternators to provide electrical power.
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
Find out the crude death rate, age specific death rate, standard death rate and adjusted death rate.
A retail federation conducted a nationwide survey of 1000 adults last October and found that approximately 55% of the respondents planned to do some type of Halloween decorating.
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
To determine the public's opinion of the police department, the police chief obtains a cluster sample of 15 census tracts within his jurisdiction and samples all households in the randomly selected tracts. Uniformed police officers go door to door..
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
Find out the least-squares regression line and interpret its slope.
A retail store manager is trying to estimate the average purchase transaction amount for a particular store. She takes a sample of 35 transactions and determines the mean purchase transaction amount from this same is $85 with a standard deviation ..
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of -1.34? a) strong linear correlation b) weak linear correlation c) impossible, d) calculation error no linear correlation
If a sample of 25 workers found that the average work week is 48 hours, conduct a hypothesis test to determine if there is significant evidence that the length of the average work week has increased? Use alpha=.05
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