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The Human Relations Department of Electronics Inc. would like to include a dental plan as part of the benefits package. The question is: How much does a typical employee and his or her family spend per year on dental expenses? A sample of 45 employees reveals the mean amount spent last year was $ 1,820, with a standard deviation of $ 660.
a) Construct a 95 percent confidence interval for the population mean.
b) The information from part (a) was given to the president of Electronics Inc. He indicated he could afford $ 1,700 of dental expenses per employee. Is it possible that the population mean could be $ 1,700 ? Justify your answer.
The new independent variable improves the predictive power of the regression model.
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
To find out the proportion of the population of likely voters who agree the statement. Could we say among appropriate statistical certainty which the proportion of the population of likely voters.
Suppose a stock analyst wants to determine whether there is a difference in the mean rate of returns for three types of stock - utility, retail, and banking.
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
What does central limit theorem say about distribution of John's average payoff after 365 bets in a year?
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Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
The critical F value with 6 numerator and 60 denominator degrees of freedom at α = .05 is:
Calculate an 85% confidence interval for the population mean number of wolf pups per den at southwestern United States (US).
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For the 20 test scores shown, find the percentile rank for a score of 86.
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