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If the sum of squares total is 800 and the sum of squares error is 170. What is the r-squared value?
A. lower than .25
B. between .26 and .5
C. between .51 and .75
D. between .76 and 1.00
E. greater than 1.01
Suppose the download times for a commercial tax preparation site are normally distributed with a mean download time of 2.0 seconds and a standard deviation of 0.5 second.
Student A and B took different statistics classes and 2 different finals. Student A had a score of 83 out of 100 and ranked 72 in his class. Student b scored 85 out of 100 and he ranked in the 70 percentile of his class.
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
The new study is going to use the confidence level of 90%. The estimator or appreciative must be in 1% of the population proportion. Which is the necessary size of the sample?
According to the survey, 37% of the adults are concerned that employers are monitoring phone calls. Use the binomial distribution formula to calculate the probability that:
Set up dummy coded dummy variables to contrast each of the other groups to Group 2, medium Anxiety; run a regression to predict exam performance (Y) from these dummy coded dummy variables.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? State the null hypothesis and the alternate hypothesis.
Construct a payoff table for Mountain Ski's decision problem of how many pairs of skis to order. What is the best decision from an expected value basis?
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
Calculate the sample statistic and standard error you will use to create the test statistic.
Using the p- value approach, test the hypotheses at the 5% level of significance.
Which of the following is not an advantage of using a cluster sample instead of other types of samples?
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