Increase the sample size to 200 children

95 % of samples of 50 from pop. result in 95 % interval covers pop. mean

increase in variability of test statistics due to the est. of the pop.st.de

2.33 √(0.79)(0.21)/n ≤ .025

0.231±1.96√(0.231)(.769)/432

At 95% confidence .54 is within .05 of true proportion of resids in favor

degree of dependence among observation is negligble

average number of hours of exercise for East Coast is the same as West

The possible p values are 0.22 and 0.78

The alternative hypothesis is the mean speed of drivers is greater than 65

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Chapters 8 and 9 Practice of Statistics

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Answers

1
Chapters 8 and 9
Use a one-sided test rather than a two-sided test
Use a two-sided test instead of a one-sided test
Decrease the sample size to 50 children
Increase the sample size to 200 children
2
Chapters 8 and 9
95 % of samples of 50 from this pop. result in 95 % interval (6.73,7.67)
95% of students in high school sleep between 6.73 and 7.67 hours per day
95 % of samples of 50 from pop. result in 95 % interval covers pop. mean
95% of students in survey reported sleeping 6.73 and 7.67 hours per day
3
Chapters 8 and 9
95.5%
80%
90%
95%
4
Chapters 8 and 9
.064
.160
.080
.032
5
Chapters 8 and 9
μ<24.5
μ>25.3
μ>24.5
μ<25.3
6
Chapters 8 and 9
The example isn't large enough to assume the pop. distribution is normal.
The population standard deviation is too large.
The example does not follow a normal distribution
increase in variability of test statistics due to the est. of the pop.st.de
7
Chapters 8 and 9
1.96 √(0.5)(0.5)/n ≤ .025
1.96 √(0.5)/n ≤ .025
2.33 √(0.79)(0.21)/n ≤ .025
2.33 √(0.5)(0.5)/n ≤ .05
8
Chapters 8 and 9
100±1.645√(0.5)(0.5)/432
0.231±1.96√(0.231)(.769)/432
100±1.96√(0.5)(0.5)/432
0.231±1.645√(0.231)(.769))/432
9
Chapters 8 and 9
At 95% confidence .54 is within .05 of true proportion of resids in favor
In repeated sampling, true proportion in favor will fall in (.49,.59)
At 95% confidence, majority of resids in favor
In repeated sampling, 95% of proportions will fall in (.49, .59)
10
Chapters 8 and 9
degree of dependence among observation is negligble
sampling method is not biased
central limit theorem is applicable for the sample mean
sample size is large enough
11
Chapters 8 and 9
average number of hours of exercise for East Coast is the same as West
probability is 0.5 that East Coast and West exercise equal number of hours
average number of hours of exercise for East Coast is greater than West
Average number of hours of exercise for East Coast is different than West
12
Chapters 8 and 9
98% confidence
93% confidence
95% confidence
90% confidence
13
Chapters 8 and 9
The possible p values are 0.22 and 0.78
The only possible p value is 0.22
The only possible p value is 0.88
The only possible p value is 0.44
14
Chapters 8 and 9
The null hypothesis is the mean speed of driversis less than 65 mph
The alternative hypothesis is the mean speed of drivers is less than 65 mph
The alternative hypothesis is the mean speed of drivers is greater than 65
The null hypothesis is the mean speed of drivers os greater than 65 mph
15
Chapters 8 and 9
8
9
10
13
16
Chapters 8 and 9
Not valid b/c np is too small
Valid b/c each area resident was asked the same question
Valid b/c sample size of more than 30 was used
Valid b/c conditions are req. constructing a large sample conf. interval

Chapters 8 and 9 Practice of Statistics Flashcards | StudBud