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What about these descriptive statistics makes you wary or uncomfortable? In other words, if you were a real estate agent, would you go around spouting the answers that you gave above? Explain.
A sample of 35 different HR departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days
A random variable has a standard deviation of 16, and an unknown mean. Find the lowest size of a simple random sample so that the sample mean estimates the population mean with a standard error no larger than 0.25.
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per microliter) is measured. The sample mean is 5.23 and the sample standard deviation is 0.54. Use a 0.01 significance level to test the claim that ..
A car insurance compancy has recorded the number of claims for the past quarter by age and gender. The information is recorded below.
For each of the following statistical tests, state the null hypothesis and the two sided alternative hypothesis.
Use a scatter plot to determine the relationship between the x values and the y values.
First National Bank and City National Bank are competing for customers who would like to open IRAs. 32 weeks are randomly selected for First National Bank and another 32 weeks are randomly selected for City National.
Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
Use the binomial distribution formula to calculate the probability that:
The number of phone calls coming into a switchboard in the next five minutes will either be 0, 1, or 2. The probabilities are the same for each of these (1/3).
On a graph, the vertical difference between the observed and predicted values of the response variable for an individual is called the
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
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