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Suppose the length of time a person takes to use an ATM machine is normally distributed with mean μ = 100 seconds and standard deviation σ = 10 seconds. There are n = 4 people ahead of Jackson in a line of people waiting to use the machine. He is concerned about T = total time the four people will take to use the machine.
a. What is the mean value of T = total time for the four people ahead of Jackson?
b. Assuming that the times for the four people are independent of each other, determine the standard deviation of T.
Find the Pearson correlation coefficient for the following set of data using the computational formula from the tutorial. Are these sample data sufficient to reject H0: r = 0 for ? = 0.05, two-tailed? What proportion of the variance in Y is accounted..
The results are SSBL = 2,312, SSTR =3,233, and SSE =12,386. Are all three sweeteners equally effective in reducing weight?
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
The 30 members of an orchestra were asked how many instruments each could play. The results are set out in the frequency distribution. Calculate the mean number of instruments played:
In a two-tailed hypothesis testing at significance level α of 0.05, the test statistic is calculated as 2. If P(X >2) = 0.03, then we have sufficient evidence to reject the null hypothesis.
An urn contains 9 yellow balls and 4 white balls. If Vince chooses 8 balls at random from the urn, what is the probability that he will select 6 yellow balls and 2 white balls? Round your answer todecimal places.
find the approximate value of z that gives an area of 0.025 to the right of it. round your answer to the nearest
The mean monthly mortgage paid by all home owners in a city is $1260 with a standard deviation of $140. Using Chebyshev's theorem, find the interval [L, U], that contains monthly mortgage payments of at least 90% of all home owners.
Using Regression Analysis for Demand Forecasting for a Pizza Company
Construct a demerits per unit control chart. Revise the control limits if necessary, assuming special causes for points that are out of control.
A student population consists of 55% females and 45% males. A researcher recorded the gender of each student emerging from a theater and found a total of 385 females and 215 males.
Write null and alternative hypotheses about the relationship between the two variables in this situation. Make your hypothesis statements specific to this situation.
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