EBK INTRODUCTION TO THE PRACTICE OF STA
EBK INTRODUCTION TO THE PRACTICE OF STA
9th Edition
ISBN: 8220103674638
Author: Moore
Publisher: YUZU
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Chapter 5.2, Problem 27E

(a)

To determine

The population mean of 10 players.

(a)

Expert Solution
Check Mark

Answer to Problem 27E

Solution: The population mean is 120.5_.

Explanation of Solution

The population mean is calculated as given below.

PlayerTotal time(X)098163213732104525886151713381059168i=09Xi=1205

μ=i=1nXin=120510=120.5

Hence, the population mean is 120.5.

(b)

To determine

The simple random sample of size 3.

(b)

Expert Solution
Check Mark

Answer to Problem 27E

Solution: The selected simple random sample is the players numbered 1, 9, and 2.

Explanation of Solution

There are nine players numbered 0,19. The players in this study are selected using the random number table provided in the book. The three random numbers of one digit are chosen from the random number table, starting from the 101st row and the first column. The random number is selected between 0 and 9. The obtained samples are 1, 9, and 2. The players who have the same numbers with the selected random numbers will be included in the sample.

To determine

The sample mean.

Expert Solution
Check Mark

Answer to Problem 27E

Solution: The sample mean is 122.67_.

Explanation of Solution

The sample mean is calculated as

X¯=i=1n=3Xin=63+168+1373=3683=122.67

The sample mean of sample observations 1, 9, and 2 is 122.67.

(c)

To determine

The simple random samples of size 3 nine times.

(c)

Expert Solution
Check Mark

Answer to Problem 27E

Solution: The simple random samples obtained are

(9,5,0),(0,5,7),(2,8,7),(9,6,4),(1,2,5),(4,2,5),(8,2,8),(7,3,6),(4,7,1)_

Explanation of Solution

There are nine players numbered 0,1,..,9. The players in this study are chosen using the random number table provided in the book. The three random numbers of one digit are chosen from the random number table, starting from the 101st row and the first column of the table. The random number is selected between 0 and 9. The obtained samples are 9, 5, and 0. The players who have the same numbers with the selected random numbers are included in the sample. The remaining eight samples are drawn in the similar manner.

Hence, the table of all the 10 samples obtained is drawn as

Sample numberSample observations1(1,9,2)2(9,5,0)3(0,5,7)4(2,8,7)5(9,6,4)6(1,2,5)7(4,2,5)8(8,2,8)9(7,3,6)10(4,7,1)

To determine

The sample mean of the simple random samples drawn above.

Expert Solution
Check Mark

Answer to Problem 27E

Solution: The sample mean for each simple random sample is shown in the table below.

Explanation of Solution

The sample mean is calculated as

X¯=i=1n=3Xin=168+88+983=118

The sample means for 10 random samples are computed in a similar way. The table showing calculation for the computation of the sample mean is drawn below:

Sample numberSimple random samples Sample ObservationsSample mean11,9,263,168,13763+168+1373=122.6729,5,0168,88,98168+88+983=11830,5,798,88,13398+88+1333=106.3342,8,7137,105,133137+105+1333=12559,6,4168,151,52168+151+523=123.6761,2,563,137,8863+137+883=9674,2,552,137,5552+137+553=81.3388,2,8105,137,105105+137+1053=115.6797,3,6133,210,151133+210+1513=164.67104,7,152,133,6352+133+633=82.67

To determine

To graph: The histogram showing the 10 values of sample mean.

Expert Solution
Check Mark

Explanation of Solution

The histogram showing the values of 10 sample mean is drawn in Minitab. The steps are written below:

Step 1. Enter the data in Minitab classifying the sample mean of 10 samples.

Step 2. Click on Graph in toolbox and click on histogram.

Step 3. Next, choose simple histogram option appearing in the dialog box and click OK.

Step 4. Drag the sample mean appearing on the left side in Graph variables and click on OK..

Graph: The obtained histogram showing the frequency and sample mean is as follows:

EBK INTRODUCTION TO THE PRACTICE OF STA, Chapter 5.2, Problem 27E

(d)

To determine

Whether the center of the histogram is close to population mean.

(d)

Expert Solution
Check Mark

Answer to Problem 27E

Solution: The center of the histogram is close to population mean.

Explanation of Solution

The histogram drawn in part (c) shows that the sample means of 10 samples are close to 120 and the population mean computed in part (a) is equal to 120.5. This shows that the population mean is approximately equal to the sample means obtained by drawing 10 simple random samples from the population.

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Chapter 5 Solutions

EBK INTRODUCTION TO THE PRACTICE OF STA

Ch. 5.1 - Prob. 11ECh. 5.1 - Prob. 12ECh. 5.1 - Prob. 13ECh. 5.1 - Prob. 14ECh. 5.1 - Prob. 15ECh. 5.1 - Prob. 16ECh. 5.2 - Prob. 17UYKCh. 5.2 - Prob. 18UYKCh. 5.2 - Prob. 19UYKCh. 5.2 - Prob. 20UYKCh. 5.2 - Prob. 21UYKCh. 5.2 - Prob. 22UYKCh. 5.2 - Prob. 23UYKCh. 5.2 - Prob. 24UYKCh. 5.2 - Prob. 25ECh. 5.2 - Prob. 26ECh. 5.2 - Prob. 27ECh. 5.2 - Prob. 28ECh. 5.2 - Prob. 29ECh. 5.2 - Prob. 30ECh. 5.2 - Prob. 31ECh. 5.2 - Prob. 32ECh. 5.2 - Prob. 33ECh. 5.2 - Prob. 34ECh. 5.2 - Prob. 35ECh. 5.2 - Prob. 36ECh. 5.2 - Prob. 37ECh. 5.2 - Prob. 38ECh. 5.2 - Prob. 39ECh. 5.2 - Prob. 40ECh. 5.2 - Prob. 41ECh. 5.2 - Prob. 42ECh. 5.3 - Prob. 43UYKCh. 5.3 - Prob. 44UYKCh. 5.3 - Prob. 45UYKCh. 5.3 - Prob. 46UYKCh. 5.3 - Prob. 47UYKCh. 5.3 - Prob. 48UYKCh. 5.3 - Prob. 49UYKCh. 5.3 - Prob. 50UYKCh. 5.3 - Prob. 51UYKCh. 5.3 - Prob. 52UYKCh. 5.3 - Prob. 53UYKCh. 5.3 - Prob. 54UYKCh. 5.3 - Prob. 55UYKCh. 5.3 - Prob. 56UYKCh. 5.3 - Prob. 57ECh. 5.3 - Prob. 58ECh. 5.3 - Prob. 59ECh. 5.3 - Prob. 60ECh. 5.3 - Prob. 61ECh. 5.3 - Prob. 62ECh. 5.3 - Prob. 63ECh. 5.3 - Prob. 64ECh. 5.3 - Prob. 65ECh. 5.3 - Prob. 66ECh. 5.3 - Prob. 67ECh. 5.3 - Prob. 68ECh. 5.3 - Prob. 69ECh. 5.3 - Prob. 70ECh. 5.3 - Prob. 71ECh. 5.3 - Prob. 72ECh. 5.3 - Prob. 73ECh. 5.3 - Prob. 74ECh. 5.3 - Prob. 75ECh. 5.3 - Prob. 76ECh. 5.3 - Prob. 77ECh. 5.3 - Prob. 78ECh. 5.3 - Prob. 79ECh. 5.3 - Prob. 80ECh. 5.3 - Prob. 81ECh. 5.3 - Prob. 82ECh. 5.3 - Prob. 83ECh. 5 - Prob. 84ECh. 5 - Prob. 85ECh. 5 - Prob. 86ECh. 5 - Prob. 87ECh. 5 - Prob. 88ECh. 5 - Prob. 89ECh. 5 - Prob. 90ECh. 5 - Prob. 91ECh. 5 - Prob. 92ECh. 5 - Prob. 93ECh. 5 - Prob. 94ECh. 5 - Prob. 95ECh. 5 - Prob. 96ECh. 5 - Prob. 97ECh. 5 - Prob. 98ECh. 5 - Prob. 99ECh. 5 - Prob. 100ECh. 5 - Prob. 101ECh. 5 - Prob. 102E
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