Quiz #1-Statistical Analysis
A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss.
She randomly assigns half of a group of overweight persons to a treatment group who are given
the herb with instructions for
Stats Quiz#2
Question 1 of 20
5.0 Points
The table shows the price of a volatile stock from the months January 1999 through December
1999 as determined by the closing price on the last trading day of the month. The price is
rounded to the nearest dollar.
Question 1 of 20
5.0 Points
A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random
sample of 24 students is selected and the mean test score of the sample is computed. What
percentage of sample means are less than 70?
Question 1 of 20
5.0 Points
Al and Joe are two county sheriffs deputies assigned to watch for traffic violations. Their arrest
and conviction records for May and June are shown below.
Who had the best conviction percentage in June?
A. Al
B. Joe
C. They ar
ASSIGNMENT 05
MA260 Statistical Analysis I
Directions: Be sure to save an electronic copy of your answer before submitting it to
Ashworth College for grading. Unless otherwise stated, answer in complete sentences,
and be sure to use correct English, spell
Question 1 of 40
A consumer advocacy group claims that the mean amount of juice in a 16
ounce bottled drink is not 16 ounces, as stated by the bottler.
Determine the null and alternative hypotheses for the test described.
A.
H0: = 16 ounces Ha: < 16 ounce
ASSIGNMENT 08
MA260 Statistical Analysis I
Directions: Be sure to save an electronic copy of your answer before submitting it to
Ashworth College for grading. Unless otherwise stated, answer in complete sentences,
and be sure to use correct English, spell
Question 1
The following dot plot represents the ages of the people in a sample selected from a group of
campaign volunteers.
How many people were in the sample?
A. 15
B. 21
C. 27
D. 28
Question 2
Identify the class that has had the greatest percentage in
Question 1 of 20
The father of a junior high school student wants to determine the most popular book among
junior high students. Select the sample with the least potential bias.
A. A randomly selected group of 10 book sellers
B. A randomly selected group
ASSIGNMENT 08
MA260 Statistical Analysis I
Directions: Be sure to save an electronic copy of your answer before submitting it to
Ashworth College for grading. Unless otherwise stated, answer in complete sentences,
and be sure to use correct English, spell
ASSIGNMENT 05
MA260 Statistical Analysis I
Directions: Be sure to save an electronic copy of your answer before submitting it to
Ashworth College for grading. Unless otherwise stated, answer in complete sentences,
and be sure to use correct English, spell
1. Repair number 1
z=
7590
=0.6818
22
Cost was 0.6818 which is below the mean repair cost.
Repair number 2
z=
10090
=0.4545
22
Cost of repair was 0.4545 which is above the mean repair cost.
z=
2. a)
415400
10
= 1.500
So the Area will be as follows
P (z 1.
1. The mean would be as follow
X P(x) =
2 0.50 + 8 0.30 + 10 0.20 = 5.40
Mean = 5.40
The variance would be as follows
x ^2 P(x) mean ^2 =
2^ 2 0.50 + 8 ^2 0.30 + 10 ^2 0.20 (5.40) ^2 = 2.00 + 19.20 + 20.00 29.16 =
12.04
Variance = 12.04
2. A) 6C3 / 8C3 =