1) To build a confidence interval for the average amount IUPUI undergraduate stu
ID: 2507564 • Letter: 1
Question
1) To build a confidence interval for the average amount IUPUI undergraduate students spend on textbooks each academic year, a sample of n = 120 students provided a sample mean of x? = $575 and standard deviation of s = $140. The standard error of the mean used to build the interval is se(x?) = _____.A $54.79
B $140.00
C $1.17
D $12.78
2) Given x? = $575 and s = $140 we are 95% confident that average annual expenditure on textbooks is between _____ and _____.
A $535 $615
B $545 $605
C $550 $600
D $555 $595
3) As a class project, each of 260 students taking E270 is required to obtain a sample of n = 100 students and build a 95% confidence interval for the average annual textbook expenditure. The instructor thus receives 260 different interval estimates. The instructor would expect _____ of these intervals to contain the population mean textbook expenditure.
A 234
B 247
C 100
D 95
4) Assume the distance travelled by IUPUI students to the campus is normally distributed. A small sample of n = 5 students is selected and the following data (in miles travelled) are observed:
5 14 3 10 8
The sample standard deviation is s = _____ miles.
A 4.30
B 3.85
C 1.92
D 1.72
5) Given the sample data in the previous question, the lower and upper end of a 95% interval estimate of the distance travelled are L = _____ miles and U = _____ miles.
A 3.9 12.1
B 5.0 11.0
C 4.2 11.8
D 2.7 13.3
1) To build a confidence interval for the average amount IUPUI undergraduate students spend on textbooks each academic year, a sample of n = 120 students provided a sample mean of x? = $575 and standard deviation of s = $140. The standard error of the mean used to build the interval is se(x?) = _____.
A $54.79
B $140.00
C $1.17
D $12.78
2) Given x? = $575 and s = $140 we are 95% confident that average annual expenditure on textbooks is between _____ and _____.
A $535 $615
B $545 $605
C $550 $600
D $555 $595
3) As a class project, each of 260 students taking E270 is required to obtain a sample of n = 100 students and build a 95% confidence interval for the average annual textbook expenditure. The instructor thus receives 260 different interval estimates. The instructor would expect _____ of these intervals to contain the population mean textbook expenditure.
A 234
B 247
C 100
D 95
4) Assume the distance travelled by IUPUI students to the campus is normally distributed. A small sample of n = 5 students is selected and the following data (in miles travelled) are observed:
5 14 3 10 8
The sample standard deviation is s = _____ miles.
A 4.30
B 3.85
C 1.92
D 1.72
5) Given the sample data in the previous question, the lower and upper end of a 95% interval estimate of the distance travelled are L = _____ miles and U = _____ miles.
A 3.9 12.1
B 5.0 11.0
C 4.2 11.8
D 2.7 13.3
Explanation / Answer
1)A
2)A
3)B
4)D
5)C
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