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NE EXAM- Sampling and Descriptive Statistics Davon Brunes: Attempt 1 Question 8 (5 points) Match the following statements that refer to a bell-shaped data set. Within one standard deviation Approximately 68% of the data lie in this interval 1. of the mean Within three standard deviations of the mean Within two standard deviations of the mean Approximately 95% of the data lie in this interval 2. All or almost all of the data lie in this interval 3, Question 9 (7 points) In a sample of five exams from an economics class, me number of points deducted is as follows: Calculate the sample variance. 25, 22, 24, 20, 21 Write only a number as your answer. Round to one decimal place (for example: 8.3) Your Answer: Answer Question 10 (7 points) Following are closing prices of Google stock for a sample of trading days. Use the 1-Var Stats command in the TI-84 PLUS calculator to compute the sample standard deviation 441.08.482.37,483.19,469.14,49799, 475.10, 472.08, 444.95, 480.46 Write only a number as your answer. Round to two decimal places (for example: 8.32),
1- ONLINE EXAM - Sampling and Descriptive Statistics 2:00:00 Davon Brunes: Attempt 1 Question 13 (7 points) A study studied the birth weights of 602 babies born in the United States. The mean weight was 3234 grams with a standard deviation of 871 grams. Assume that birth weight data are approximately bell-shaped. Estimate the number of newborns who weighed between 1492 grams and 4976 grams. Write only a number as your answer. Round your answer to the nearest whole number Your Answer 11 12 Answer 14 15 Question 14 (7 points) For a certain type of truck, the mean number of miles per gallon is 22.9 and the standard deviation is 5.8. Assume gas mileage for this type of truck to be approximately bell-shaped. Compute the z-score for a truck whose gas mileage is 15 Write only a number as your answer. Round your answer to two decimal places (for example: 3.15). Your Answer Answer Question 15 (7 points) A population has mean 36 and standard deviation 18. What is the data value that has a z score of -1? Write only a number as your answer Your Answer
t_frame_autod2tur 1 7301 4 1 &isprva &drc 1 & qia 2494660&cfgl-0&dnb : 0 INE EXAM- Sampling and Descriptive Statistics Davon Brunes: Attempt 1 Question 16 (7 points) Following is a sample of the number of words spoken in each inauguration address for U.S. presidents 1.125 2,978 1,172 1,507 4,776 3,801 2.015 2.463 4,388 135 3,967 1.561 1.437 3,217 1,340 1.681 2,546 2,158 2,170 5,433 1.729 698 What is the 32nd percentile? Write only a number as your answer Your Answer: Answer Submit Quiz 8 of 16 questions saved
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3 열 25,22,24,20,21 44108, 422.3 4, 469. 14, 9, 75.1o, e2 4 2.08, 444.95, 480.46 se viati) 18. 32 P 149 2 2134334)-lz 2 1492 3234 2구) and 4476 io 54S 5.Go 9 512 K-36 1g

Q 16.

> x=c(1125,2978,1172,1507,4776,3801,2015,2463,4388,135,3967,1561,1437,3217,1340,
+ 2308,1681,2546,2158,2170,5433,1729,698)
>
> quantile(x, 0.32)
32%
1565.8

The 32nd percentile value is 1565.8.

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