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Use the information from the survey. Assume that "number of sales calls" is the independent variable, and draw a scatter diagram of number of sales calls and number of units sold. Estimate a simple linear regression model to explain the relationship between number of sales calls and number of units sold. Calculate and interpret the coefficient of correlation, the coefficient of determination, and the standard error of estimate. Conduct a test of hypothesis to determine whether the coefficient of correlation in the population is zero. Construct and interpret confidence intervals and prediction intervals for the dependent variable, number of units sold.
It was reported that approximately 45% of all university professors are extroverted. Suppose you have classes with 6 different professors.
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
Suppose that the probability is 1 in 3,900,000 that a single auto trip in the U.S. would result in the death of the driver. Over a lifetime, an average U.S. driver takes 50,000 trips.
Thirty-six percent of women consider themselves basketball fans. You randomly select six women and ask each if she considers herself a basketball fan. a) construct a binomial distribution.
What would be the critical value under the null hypothesis if the size of your test were 5%?
Findout the 98% confidence interval for true mean. Findout a 98% confidence interval for the cigarette tax in all 50 states.
A Pew research study recently randomly selected two groups of people, men and women and asked them if they agree with the following statement:
The U.S. government recently reported that the proportion of people feeling negative about the economy was only 30%. However, a recent poll by CNN/Gallup found that in a sample of 1000 people 450 of them felt negative about the economy.
Batch has just been completed. Determine probability that first three units manufactured in this batch will contain at least total of 4 defects?
Determine the probability of selecting sample with a mean of more than $100,000 but less than $112,000.
Calculate P value? Calculate critical value?
The following represents a project that should be scheduled using CPM. What is the probability of completing this project within 16 days?
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