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In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. Find P45, which is the consumption level separating the bottom 45% from the top 55%.
A researcher demonstrated a correlation of r = 0.60 between teacher attire and student academic performance across 150 grade schools in her state.
Two people are playing a game. Only one dice is thrown. If the outcome is a 2 or a 3, then player 1 pays player 2 $6. How much should player 2 pay player 1 when a 1, 4, 5 or 6 is thrown so that player 1 and 2 break even
P-value for test statistic is .085, determine the minimum level of significance needed to reject null hypothesis?
If the company's report is correct, what is the probability that the average balance of an account in the sample is $383 or less?
The salaries of the employees of a corporation are normally distributed with a mean of $25,000 and a standard deviation of $5,000.
The personnel director of Cander Machine Products is investigating perfectionism on the job. A test designed to measure perfectionism was administered to a random sample of 18 employees.
The χ 2 statistic from a contingency table with 6 rows and five columns will have:
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
Test the manager's claim at 5% and 1% significance level tests.
Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. In the 1950s, the average score on the child manifest anxiety scale was µ=15.1. A sample of n=16 of today's children produces ..
Find a 95% confidence interval for the mean price of all summer sleeping bags.
You are given the following data. Test the claim that there is a difference in the means of the two groups. Use = 0.01. State the null and alternate hypotheses
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