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If the correlation coefficient is -0.15, what is the sign of the slope of the regression line?
If we chose an alumnus at random, what is the probability that the alumnus would say their experience met or surpassed expectations?
The following probability assignments apply: P(E1) .05, P(E2) .20, P(E3) .20, P(E4) .25, P(E5) .15, P(E6) .10, and P(E7) .05. Let A ={E1, E4, E6} B= {E2, E4, E7} C ={E2, E3, E5, E7}
The FICO credit rating scores obtained in a simple random sample are listed below. As writing, the reported mean FICO score was 678. Do these sample FICO scores appear to be consistent with the repo
Question: What type of educational background do CEOs have? In one survey, 344 CEOs of medium and large companies were asked whether they had an MBA degree. There were 97 MBAs. Estimate with 95% con
After tallying the responses, she found that 204 used statistical inference within one year of graduation. Estimate with 90% confidence the proportion of all business school graduates who use their
He observed several hundred games and counted the number of times a runner on first base attempted to steal second base. He found there were 373 such events, of which 259 were successful. Estimate
What was the sample size for this survey? Are the data categorical or quantitative? Would it make more sense to use averages or percentages as a summary of the data for this question?
Compute the slope of the regression line for the data below:
Discuss the effect on the width of the confidence interval estimate of reducing the sample proportion.
In a random sample of 500 observations, we found the proportion of successes to be 48% Estimate with 95% confidence the population proportion of successes.
For a population with a mean of µ = 50 and a standard deviation of s = 10, how much error, on average, would you expect between the sample mean (M) and the population mean for:
Make an inference about the population of all investment managers concerning the average return expected on equities over the next 12 months.
For the population of women whose mothers did not take the drug DES during pregnancy, what is the estimate of the number of women out of 1000 who would be expected to have tissue abnormalities?
The probability of obtaining a head when a certain coin is flipped is about 0.65. What is the probability that heads would be obtained 15 or fewer times when this coin is flipped 25 times?
Calculate each of the following values for the data set below (assume it is a population). a. Variance b. Standard deviation c. Skewness
In the construction of a pie chart, how many degrees would be in the section of the pie showing the Yes answers? How many degrees would be in the section of the pie showing the No answers?
Describe the distribution of sample means (shape, expected value, and standard error) for samples of n=36 selected from a population with a mean of µ = 100 and a standard deviation of ? = 12.
Pay 15% deposit upfront and pay the balance over 2 years, in equal monthly instalments. Assuming a simple rate of interest at 12% per year, how much would you pay per month?
The population of IQ scores forms a normal distribution with a mean of µ = 100 and a standard deviation of ? = 15. What is the probability of obtaining a sample mean greater than M = 105,
What is a "Chi-Squared Test"? Provide a fully referenced explanation.
Use descriptive statistics to summarize the following data collected on food quality. What is your feeling about the food quality ratings at the restaurant?
The monthly average sales of the Smiling Ninja Computer Company may be approximated to a normal distribution curve. It has a mean of $22,000 and a standard deviation of $3,300. Drawing a curve for
Show the cumulative relative frequency distribution. What proportion of patients needing emergency service wait 9 minutes or less?