b Compute the first and third quartiles c Compute the range and interquartile

# B compute the first and third quartiles c compute the

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b. Compute the first and third quartiles. c. Compute the range and interquartile range. 2.)Consider a sample with data values of 37, 35, 30, 25, 30, 39, 40, and 28. Compute the following values. a. Mode. b. 40th percentile. d. Standard deviation. 2.) A population of 1,000 students spends an average of \$10.50 a day on dinner. The standard deviation of the expenditure is \$3. A simple random sample of 64 students is taken. a. What are the expected value, standard deviation, and shape of the sampling distribution of the sample mean?
b. What is the probability that a student will spend more than \$11? 1.) the average lifetime of a light bulb is 3000 hours with a standard deviation of 696 hours. A simple random sample of 36 bulbs is taken. a. What is the expected value, standard deviation, and the shape of the sampling distribution of the average life of the light bulb? b. What is the probability that the average life in the sample will be between 2670.56 and 2809.76 hours? 1.) During the 2003 season, Major League Baseball took steps to speed up the play of baseball games in order to maintain fan interest (CNN Headline News, September 30, 2003). The following results come from a sample of 60 games played during the summer of 2002 and a sample of 50 games played during the summer of 2003. The sample mean shows the mean duration of the games included in each sample. 2002 Season, n1=60, x1=2hours and 52 minutes 2003 Season, n2=50, x2=2hours and 46 minutes a. A research hypothesis was that the steps taken during the 2003 season would reduce the population mean duration of baseball games. Formulate the null and alternative hypotheses.

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• David Grimmett

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