When a market research manager records the number of potential customers who were surveyed indicating that they like the product design, the random variable, number who like the design, is a discrete random variable.
Indicate whether the statement is true or false
Q. 2The Grangeville Power Company has four classifications for its customers. For each customer classification, the company tracks the total amount of electricity used during the year.
Which of the following types of graphs would be most appropriate to use?A) A horizontal bar chart
B) A vertical bar chart
C) Both A and B would be appropriate.
D) A histogram
Q. 3Suppose it is known that the income distribution in a particular region is right-skewed and bi-modal. If bank economists are interested in estimating the mean income, which of the following is true?
A) Provided that the sample size is sufficiently large, the sampling distribution for will be approximately normal with a mean equal to the population mean that they wish to estimate.
B) The sampling distribution will also be right-skewed for large sample sizes.
C) The standard deviation of the sampling distribution for will be proportionally larger than the population standard deviation, depending on the size of the sample.
D) The sampling distribution will be left-skewed.
Q. 4A local medical center has advertised that the mean wait for services will be less than 15 minutes.
Given this claim, the hypothesis test for the population mean should be a one-tailed test with the rejection region in the lower (left-hand) tail of the sampling distribution. Indicate whether the statement is true or false
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