MAT-1160 Big Exam 1 With All Correct & 100% Verified
Answers| Updated to Pass
Calculate the standard deviation of the sample data below by hand using the formula for standard
deviation. Round the final answer to one decimal place
22,14,10, 13,5 ✔Correct Answer-6.2
The mass of a wiffle ball varies between 40 and 50 grams. You decide to gather a random sample of
wiffle balls and record the mass of each. Your data is displayed in the table below. (Units are grams.)
40.7, 48.5, 44.6, 41.2, 48.6, 44.5, 44.5, 40.5, 46
You would like to describe the variability in wiffle ball mass in your sample. You decide to make
several calculations describing the "spread" of the data set.
Use technology when possible (such as a TI calculator) to find the following measures of spread.
Round values to two decimal places as needed.
range:
IQR:
Sample standard deviation: ✔Correct Answer-Range=8.1
IQR=6.3
Sample standard deviation: 3.0g
6. A group of adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8
inches. Find the zz -score of a man 60 inches tall. Round to 2 decimal places. ✔Correct Answer--
3.21
Which of the following is not a measure of spread? ✔Correct Answer-the median
Suppose that we are studying the amount of time customers wait in line at the checkout at Gap and
Old Navy.
The mean wait time at both stores is 5 minutes.
At Gap, the standard deviation for the wait time is 2 minutes while at Old Navy it is 4 minutes.
Because Old Navy has a larger standard deviation, we know that there is _______________ variation
in the wait times at Old Navy. Overall, wait times at Old Navy are _________________ from the
average. Wait times at Gap are ___________________ near the mean. ✔Correct Answer-a. more
variation
b. more spread out
c. more concentrated
Answers| Updated to Pass
Calculate the standard deviation of the sample data below by hand using the formula for standard
deviation. Round the final answer to one decimal place
22,14,10, 13,5 ✔Correct Answer-6.2
The mass of a wiffle ball varies between 40 and 50 grams. You decide to gather a random sample of
wiffle balls and record the mass of each. Your data is displayed in the table below. (Units are grams.)
40.7, 48.5, 44.6, 41.2, 48.6, 44.5, 44.5, 40.5, 46
You would like to describe the variability in wiffle ball mass in your sample. You decide to make
several calculations describing the "spread" of the data set.
Use technology when possible (such as a TI calculator) to find the following measures of spread.
Round values to two decimal places as needed.
range:
IQR:
Sample standard deviation: ✔Correct Answer-Range=8.1
IQR=6.3
Sample standard deviation: 3.0g
6. A group of adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8
inches. Find the zz -score of a man 60 inches tall. Round to 2 decimal places. ✔Correct Answer--
3.21
Which of the following is not a measure of spread? ✔Correct Answer-the median
Suppose that we are studying the amount of time customers wait in line at the checkout at Gap and
Old Navy.
The mean wait time at both stores is 5 minutes.
At Gap, the standard deviation for the wait time is 2 minutes while at Old Navy it is 4 minutes.
Because Old Navy has a larger standard deviation, we know that there is _______________ variation
in the wait times at Old Navy. Overall, wait times at Old Navy are _________________ from the
average. Wait times at Gap are ___________________ near the mean. ✔Correct Answer-a. more
variation
b. more spread out
c. more concentrated
