Question

- Following are the fuel efficiency, in miles per gallon, for a sample of convertibles. Calculate...

- Following are the fuel efficiency, in miles per gallon, for a sample of convertibles. Calculate the sample variance. 25, 23 , 25, 20, 21 Write only a number as your answer.

Round to one decimal place (for example: 8.3).

- Following are playback time, in hours, for a sample of MP3 players, Calculate the sample standard deviation. 23,35,28,18,25,21,37,28 Write only a number as your answer. Round to two decimal place (for example: 8.32).

- Following are closing prices of Google stock for a sample trading days. Use the 1-Var Stats command in the TI-84-Plus calculator to compute the sample standard deviation,

441.19,482.37,483.19,478.50,475.10,472.08,444.95,481.86

Write only a number as your answer. Round to two decimal place (for example: 8.32).

- In a large sample of customer accounts, a utility company determined that the average number of days between when a bill was sent out and when the payment was made is 12 with a standard deviation of 19 days. Assume the data to be approximately bell shaped. Approximately 95% of all customer accounts have the average number of days between two values A and B.What is the value of B? Right only a number as your answer

- A Study studied The birth weight of 2997 babies born in the United States. The main weight was 3234 grams with a standard deviation of 871 grams. Assume that birthweight data are approximately bell shaped. Estimate the number of newborns who weighed between 1492 grams in 4976 grams. Write only a number as your answer. Round your answer to the nearest whole number

- The GMAC insurance company reported that the mean score on the national drivers test was 81.4 with a standard deviation of 3.1 points. The test scores are approximately bell shaped. Approximately 68% of all test scores were between two values A & B. What is the value of a? Write only A number as your answer. Round to one Decimal Place.

Homework Answers

Answer #1

1. For the given sample mean

Create the following table.

data data-mean (data - mean)2
25 2.2 4.84
23 0.2 0.04
25 2.2 4.84
20 -2.8 7.84
21 -1.8 3.24

Find the sum of numbers in the last column to get.

So Variance is

2. For the given data sample mean is

Create the following table.

data data-mean (data - mean)2
23 -3.875 15.015625
35 8.125 66.015625
28 1.125 1.265625
18 -8.875 78.765625
25 -1.875 3.515625
21 -5.875 34.515625
37 10.125 102.515625
28 1.125 1.265625

Find the sum of numbers in the last column to get.

So standard deviation is

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