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In a normal population with sigma=20, a random sample of size n gave X(mean)=56.53. At the 5% significance level, make a two-tailed test of the null hypothesis mu=50, when (a) n=24 (b) n=36
In each case report the P value
Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
What is the relationship between the amount spent per week on food and the size of the family? Do larger families spend more on food?
Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is ..
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
Portfolio Risk. Who would view the stock of Learning Tower of Pita as a risk reducing investment - the owner of a gambling casino or a successful bankruptcy lawyer? Explain.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
The following regression equation and correlation coefficient were calculated using minitab for the bivariate data age of men and their weight.
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