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An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
A B C D F
6 14 22 8 4
Find the critical value. Use alpha= 0.05
A) 9.236
B) 7.779
C) 11.070
D) 9.488
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
Use Chebyshev's theorem to determine what percent of values will fall between 58 and 82 for data set with mean of 70 and standard deviation of 4.
The regression equation is Y = 29.29 - 0.96X, the sample size is 8, and the standard error of the slope is 0.22. What is the critical value to test the significance of the slope at the 0.01 significance level?
To test whether there is a significant mean difference among the three.
Formulate a suitable null and alternative hypothesis to test the students' claim that they followed their instructor's recommendation at a 5% level of significance and interpret your findings.
The following data provided by a coffee company are the roast time in minutes for five batches of coffee (x) and the resulting shrinkage in percent of the coffee weight(y).
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 198 turn out to be currently enrolled in college.
A sample of size 36 results in a sample mean of 7.1. The value of the test statistic is ____
Construct a 99% confidence interval for the proportion of customers favoring underground installation.
Three times each year, the procurement manager at Phoenix contacts National\'s marketing department to place a monthly order for each of the coming four months.
What fraction of the calls last between 4.2 and 5 minutes?
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
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