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In a distribution of fingernail length where n= 196, σ = 7 & x bar = .75, compute a 92% Interval Estimate. & determine if Zelda, whose nails are 1.87 long, will be within the interval?
a professional employee in a large corporation receives an average of m 42.4 e-mails per day. most of these e-mails
A civil service exam is given to 200 job applicants. In recent years, grades have followed a normal distribution with mean 66.5 and variance 100. The grades of the job applicants are distributed as follows:
Translate the following arguments into symbolic form.- Einstein won the Nobel Prize either for explaining the photoelectric effect or for the special theory of relativity.
In a random sample of 40 refrigerators, the mean repair cost was $121.00 and the population standard deviation is $15.80. Construct a 90%confidence interval for the population mean repair cost. Interpret the results.
(a) What is the sample mean of annual medical expenses? (b) What is the confidence level of the interval estimate (as a decimal)?
Suppose that population standard deviation is known to be 10mmHg and samples are from Normal population, test a= 0.01 if blood pressure reading is different from 135mmHg
Are the data sufficient to conclude that children with a history of childcare show significantly more behavioral problems than the average kindergarten child? Use a one-tailed test with a = .01.
What is the correct decision - In testing if the diameter of a tree is significant, state the null and alternative hypothesis - Write down a second order linear model with interaction.
What is an appropriate null hypothesis to compare the quality of the product manufactured in the overseas plants and the U.S. plants? Why?
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1000 people from the same population found that 550 were pro-life (i.e. 55%), which would you find to be more significant? Why?
Proportion of free throw attempts that are successful. In the NBA, FT% is normally distributed with a mean of 0.721 and a standard deviation of 0.082. Which percentage of NBA players have a FT% lower than 0.784?
Thus, depending on the value of the correlation coefficient ρ, the joint PDF of X1 and X2 may resemble one of the graphs of Figure 4.5 with X1 = X and X2 = Y.
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