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If the standard deviation of all pumps σ is also unknown, compute a 95% confidence interval for μ if the average for randomly selected 20 heat pumps is 4.85 with s = 1.2.
Also, if the standard deviation of all pumps σ is unknown, is there an easier formula to estimate the sample size to control the width of the confidence interval? Please explain it.
State the hypotheses that you are testing. Determine the critical value of χ2 and your decision rule. Calculate the χ2 test statistic for this data. (Show all workings). State your decision and conclusion.
in a research project intended to gather data on the effects of type of study method on examination performance
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
five samples of the material were tested in a structure and the average interior temperature reported was as follows
The sample has a mean of 4.8 years and a standard deviation of 2.2 years. Use a .05 significance level to test the claim that the mean time for all college students is greater than 4.5 years.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
a sample of 200 monthly observations is used to run a simple linear regression returns ?0 ?1 leverage ?. a five
A thorough examination reveals there is nothing wrong with the filling machine. From a statistical standpoint, was there a "type" error made? If yes, which type? Explain.
a new york timescbs poll asked the question what do you think is the most important problem facing this country today?
seventy percent of the bicycles sold by a certain store are mountain bikes. among 100 randomly selected bike purchases
for boys the average number of absences in the first grade is 15 with a standard deviation of 7 for girls the average
The store used ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic?
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