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Q. An owner of a chain of stores would like to predict weekly sales based on the number of customers who made a purchase. A random sample of 10 stores were selected. The weekly sales are in thousands of dollars. What is the slope, y-intercept and the conclusion based from the data. Customers Weekly Sales --------- ------------ 907 11.20 926 11.05 506 6.84 741 9.21 789 9.42 889 10.08 874 9.45 510 6.73 529 7.24 420 6.12
A company wants to determine if employees have any preferences among 5 different health plans. A sample of 200 employees provided the data below.
Last year the records of Dairy Land Inc., a convenience store chain-What is the p-value? Follow the five-step hypothesis testing procedure.
How many Standard Errors is $850 below $900? If we want to test the null hypothesis that the hotline does not reduce costs, what would be the conclusion based on this data?
The company sells Mr. Brophy an insurance policy and he has an accident. What's the probability of Mr. Brophy being a good, medium or poor driver?
For a random sample of 50 batteries, what is the probability that the sample mean will be less than 27.5 hours?
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
What sample size would be needed to estimate the true proportion of students at your college
To perform a certain type of blood analysis, lab technicians must perform two procedures. The first procedure requires either 1 or 2 separate steps, and the second procedure requires either 1, 2, or 3 steps. a) List the experimental outcomes assoc..
CCI is unable to adjust the mean of the filling process. However, it is able to adjust the standard deviation of the filling process.
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries.
Consider random variables X and Y with a joint pmf, given in the following table. Compute the conditional expectations E[X|Y = 1] and E[X|Y > 1].
Comparison of paired and unpaired samples test - Identify which of the two tests (Independent samples and Paired samples) test is the preferred test and justify your choice.
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