STATISTICS 3.2
6. An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for each of the four crashes was $415, $454, $409, $238 5 . Compute the range, sample variance, and sample standard deviation cost of repair. The range is $ 216 $2= dollars (Round to the nearest whole number as needed.) s = $ Round to two decimal places as needed.) . Compute the range and sample standard deviation for strength of the concrete (in psi). 3930, 4050, 3200, 3100, 2950, 3850, 4050, 4030 The range is psi. S = psi (Round to one decimal place as needed.) 8. The following data represent the flight time (in minutes) of a random sample of six flights from Las Vegas, Nevada, to Newark, New Jersey, on United Airlines. 282, 270, 260, 266, 257, 267 Compute the range and sample standard deviation of flight time. The range of flight time is 25 minutes. The sample standard deviation of flight time is 8.8 minutes. Type an integer or decimal rounded to one decimal place as needed.) Which histogram depicts a higher standard deviation? Q Frequency Frequency 40 50 60 70 44 48 52 56 60 (a) (b) Choose the correct answer below. O A. Histogram a depicts the higher standard deviation, since it is more bell shaped. B. Histogram b depicts the higher standard deviation, because the bars are higher than the average bar in a. O C. Histogram b depicts the higher standard deviation, because the distribution has more D. Histogram a depicts the higher standard deviation, because the distribution has more dispersion. dispersion 10. The accompanying data represent the pulse rates (beats per minute) of nine students enrolled in a statistics course. Treat the nine students as a population. Complete parts (a) through (c). Click the icon to view the data on the students' pulse rates. (a) Compute the population standard deviation. 8.4 beats per minute (Round to one decimal place as needed.) (b) Determine the sample standard deviation of the following three simple random samples of size 3. Sample 1: {Perpectual, Crystal, Tammy} Sample 2: {Janette, Perpectual, Tammy} Sample 3: {Jeff, Tammy, Kathy} The sample standard deviation, s, of sample 1, {Perpectual, Crystal, Tammy), is beats per minute. Round to one decimal place as needed.) The sample standard deviation, s, of sample 2, {Janette, Perpectual, Tammy), is beats per minute. (Round to one decimal place as needed.) The sample standard deviation, s, of sample 3, {Jeff, Tammy, Kathy}, is beats per minute. Round to one decimal place as needed.) (c) Which samples underestimate the population standard deviation? Which overestimate the population standard deviation? Sample 1 (1) the population standard deviation. Sample 2 (2) the population standard deviation. Sample 3 (3) . the population standard deviation. 1: Student Pluse Rates Student Pulse Perpectual Bempah 84 Megan Brooks 78 Jeff Honeycutt 67 Clarice Jefferson 70 Crystal Kurtenbach 60 Janette Lantka 87 Kevin Mccarthy 74 Tammy Ohm 68 Kathy Wojdya 66 (1) O overestimates (2) O is equal to (3) O underestimates underestimates O overestimates overestimates O is equal to underestimates O is equal to YOU ANSWERED: 7.2
