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Given a population of batteries has a mean lifespan of 1000 hours and a standard deviation of 56 hours and that the lifespan is normally distributed.
a) What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
b) If we take larger size sample which of the values (for the mean and standard deviation found in part a) above will change and will it go up or down?
Calculate and interpret standard error of estimate se and coefficient of determination R2 for these data.
What was the highest score earned on the exam? According to Chebyshev's Theorem, how many students scored between 42 and 74?
Which combination of factors has greatest likelihood of rejecting null hypothesis?
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
Regression equation to predict the dependent variable using multiple regression analysis:
Let be the average of the pay you receive for the first and second week. Find the sampling distribution
The hypotheses tested by the one-way ANOVA F test - Evaluate the P-value of the ANOVA F test
Conduct an analysis of variance
The Minitab output for the Tukey Least Significant Difference multiple comparisons is below. Which means are different and similar
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