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The average length of a long distance telephone call is 28 minutes with a standard deviation of five minuts. assuming the call times are normally distributed, what percentage of calls are longer than 35 minutes.
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..
The student body of a large university comprises 60% female students. Elucidate what is the probability that the students in the sample exactly two are female?
A county has four major hospitals: 1) Regional Memorial; 2) General; 3) Charity; and 4) City. A multiple regression model is used to compare the time spent in the hospital after a heart by-pass surgery among the four hospitals.
Create by hand decision tree for this problem and then examine decision tree to recognize optimal policy. Use TreePlan to create and solve decision tree.
Do men and women have different beliefs on the ideal number of children in a family? Based on the following GSS2008 Data and the obtained t statistics, what would you conclude?
A random sample of 64 light bulbs indicates a sample mean life of 350 hours. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
Find the regression equation to predict the cognitive series score from the 7 minute screen score using SPSS. Be sure to write out the equation by hand using the variable names
At the 5% level of significance, would we reject the null hypothesis that the mean breaking load is 510 pounds or more?
Compute test statistic for sample data that you would use to test whether sample mean varies from population mean of 10 pounds at a 5 percent level of significance in two-tailed test.
Assume that a single radar unit used to detect incoming missiles has a probability of 0.90 of correctly detecting an incoming missile attack.
What fraction of cups will probably overflow if 230-milliliter cups are used for the next 1000 drinks? 0.0228 or 23 out of the 1000 drinks will overflow.
According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean $45,000 and a standard deviation of $3,000.
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