Question

A random sample of marks scored by 20 students in a CAT is listed below. Calculate the sample mean and standard deviation:

29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18

Select one:

a. 20.50, 5.94

b. 20.50, 5.79

c. 20.85, 5.94

d. 20.85, 5.79

Answer #1

A national random sample of 20 ACT scores from 2010 is
listed below. Calculate the sample mean and standard deviation. 32,
26, 13, 23, 23, 25, 18, 22, 17, 19, 15, 26, 30, 30, 18, 20, 17, 26,
17, 18
1- O 20.85, 5.94
2-20.50, 5.94
3- none of the above
4- 20.50, 5.79

____________________________________________
The results of a sample of 372 subscribers to Wired
magazine shows the time spent using the Internet during the week.
Previous surveys have revealed that the population standard
deviation is 10.95 hours. The sample data can be found in the Excel
test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
____________________________________________
Develop a 95% confidence interval for the population mean
____________________________________________
If the editors...

A study was conducted to see if students’ writing skills
continue to improve as the academic year progresses. English 101
students were asked to write essays throughout the year in
September, December, March and June. The scores were compared to
see if there is any improvement in this one-year course. Was there
a significant improvement?
The appropriate test for this problem is:
one-way ANOVA
repeated measurements
Student
September
December
March
June
1
17
23
21
24
2
25
21
21...

Assuming that the population standard deviation is
unknown, calculate the 95% confidence interval of the
population mean.
The following is the data. Calculating Process should be shown
by Excel (Formulas). What formulas in statistics are used?
7
21
23
24
18
16
2
19
11
6
3
13
17
9
5
12
13
17
4
14
15
25
12
24
22
14
14
20
15
11
26
17
21
11
4
13
16
14
13
14
25
23
9
15...

The results of a sample of 372 subscribers
toWiredmagazine shows the time spent using the Internet
during the week. Previous surveys have revealed that the population
standard deviation is 10.95 hours. The sample data can be found in
the Excel test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
Develop a 95% confidence interval for the population mean
If the editors of Wiredwanted to have the...

A random sample of 11 truant students produced the following
data, where x is the number of classes missed, and y is the final
exam score (out of a maximum of 75 points). The data are presented
below in the table of values.
x
y
10
54
11
41
12
37
14
36
15
29
16
28
18
28
19
26
22
19
25
19
26
18
What is the equation of the regression line?
Select the correct answer below:...

A sample of 200 ROM computer chips was selected on each of 30
consecutive days, and the number of nonconforming chips on each day
was as follows:
10, 21, 26, 18, 38, 20, 5, 23, 11, 22, 28, 12, 14, 22, 20, 19,
16, 25, 10, 17, 14, 17, 15, 22, 29, 15, 9, 19, 16, 25
Calculate pbar =
LCL =
UCL =

Consider the following data from a random sample: 23 12 26 14 20
25 14 11 21 14 25 21 22 21 8 19 17 22 17 16
a.) Construct a stem-and-leaf plot and specify the five-number
index (min, Q1, Q2, Q3, & max)
b.) Compute the mean and the standard deviation
c.) Find a 95% confidence interval for the population mean.

A company has the following returns over the past 30 months:
Month Ret.(%) Month Ret.(%) Month Ret.(%)
1) 3 11 -3 21 -1
2) -16 12 -2 22 -24
3) 31 13 -8 23 -14
4) 33 14 2 24 -19
5) -23 15 35 25 -19
6) -17 16 11 26 33
7) 8 17 -20 27 -18
8) -19 18 15 28 23
9) -13 19 -12 29 6
10 -17 20 17 30 5
What is...

Consider the following data:
25
24
18
20
21
18
16
20
23
17
15
13
19
23
24
20
16
26
21
24
15
22
16
12
20
23
19
26
20
25
21
19
21
25
23
26
21
19
20
14
(a)
Develop a frequency distribution
using classes of 12-14, 15-17, 18-20, 21-23, and 24-26.
Class
Frequency
12-14
15-17
18-20
21-23
24-26
Total
(b)
Develop a relative frequency
distribution and a percent frequency distribution using the classes...

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