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According to survey conducted by TD Ameritrade, one out of four investors have exchange-traded funds in their portofolios(USA Today, January 11, 2007). Consider a sample of 20 investors. A. Compute the probability that exactly 4 investors have exchange-traded funds in their portfolios. B. Compute the probability that at least 2 of the investors have exchange-traded funds in their portfolios. C. If you found that exactly 12 of the investors have exchange-traded funds in their portfolios, would you doubt the accuracy of the survey results? D. Compute the expected number of investors who have exchange-traded funds in their portfolios.
How could the engineer increase the accuracy of the interval without changing the level of confidence?
Recognize and explain potential threats (up to 3) to external validity.
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
The data show that acreage owned per family is normally distributed with a mean of 10.0 acres and a standard deviation of 1.5 acres. Calculate the percentage of families that own at least 8.1 acres
1.on one busy holiday weekend a national airline has many requests for a standby flights at half of the usual one way
Suppose 18 customers are selected at random. What is the probability that between two and six people inclusive want hot peppers?
Place the following set of numbers in ascending order. Determine the maximum and minimum values of the following set of numbers. 36/7,-1,-2/3,-5,26/9
Computing the mean, standard deviation values for the given data - Describe how statistics is being misused in this situation
question 1 find the mean and standard deviation of the number of cars that have more than 1 passenger among the 500
Among the contestants in a competition are 35 women and 20 men. If 5 winners are randomly selected, what is the probability that they are all men?
A nurse reading this finding knows that the researcher should decide that there is not enough information to decide on statistical significance.
A study was done on the accuracy of advertisements by the five types of electronics stores in a city. On each of the six days, items were randomly selected from the advertisements for each type of store and the actual price was compared to the adv..
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