https://drive.google.com/open?id=0By2NS5StRAdZMW1lSEJrbHRJekE
there is the assignment.
CHECK THE ASSIGNMENT DONT MIND THIS BELOW TEXT
Sample
two
2
3
2
8
2
5
1
4
2
6
2
1
2
8
1
7
2
4
2
0
2
3
5
3
a. Compute the mean, variance, standard deviation, median, Q 1 and Q 3 for each of the
two samples.
b. Plot boxplots of both samples on the same graph.
c. Construct 95% confidence intervals for each of the two populations’ means.
d. Construct 95% confidence interval for the difference between the two populations’
means.
e. Test whether the mean of the first population is larger 18.
f. Test whether the mean of the second population is smaller than 30.
g. Test whether the means of the two populations are not equal.
Question Two
The table below displays summarized data of daily sales of two small stores. Assuming
the sales are normally distributed, answer a-d
Variabl
e
Sampl
e Size
Mean SD
Store I 12 19.6 8.7
Store II 10 24.7 16.2
a. Construct a 90% confidence interval for the variance of daily sales of the first
store.
b. Test that the standard deviation of daily sales of the second store is larger than 12.
c. Construct a 90% confidence interval for the ratio of the variances of the daily
sales of the two stores.
d. Test that the standard deviation of daily sales of the second store is larger than
that of the first.
Question Three
A study is conducted to compare the relative effectiveness of two kinds of cough
medicines in increasing sleep. Six people with colds are given medicine A the first night,
and medicine B on the second. Their hours of sleep each night are recorded below.
Medicine
