Question

1.) Calculate both the sample and the population standard
deviations using the data below.

x |
14 | 20 | 26 | 18 | 6 | 24 |
---|

**Please show the following answers to 1 decimal
place.**

Sample Standard Deviation (ss) =

Population Standard Deviation (σσ) =

Notice the different!

2.) The highway mileage (mpg) for a sample of 9 different models
of a car company can be found below.

20 | 27 | 35 | 49 | 35 | 43 | 22 | 28 | 40 |

Find the mode:

Find the midrange:

Find the range:

Estimate the standard deviation using the range rule of
thumb:

Now use technology, find the standard deviation: (Please
round your answer to 2 decimal places.)

3.) For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 24
students, and the distribution of total study hours per week is
bell-shaped with a mean of 12 hours and a standard deviation of 2.9
hours.

Use the Empirical Rule to answer the following questions.

a) 68% of the students spend between hours
and hours on Statistics each week.

b) 95% of the students spend between hours
and hours on Statistics each week.

c) 99.7% of the students spend between hours
and hours on Statistics each week.

Answer #1

Calculate both the sample and the population standard deviations
using the data below.
x
27
3
12
10
5
29
Please show the following answers to 1 decimal
place.
Sample Standard Deviation (ss) =
Population Standard Deviation (σσ) =
Notice the different!

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 24
students, and the distribution of total study hours per week is
bell-shaped with a mean of 13 hours and a standard deviation of 2.8
hours. Use the Empirical Rule to answer the following questions. a)
68% of the students spend between hours and hours on Statistics
each week. b) 95% of the students spend between hours and...

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 23
students, and the distribution of total study hours per week is
bell-shaped with a mean of 14 hours and a standard deviation of 3.4
hours.
Use the Empirical Rule to answer the following questions.
a) 68% of the students spend between hours and hours on Statistics
each week.
b) 95% of the students spend between hours and...

For a 4-units class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 23
students, and the distribution of total study hours per week is
bell-shaped with a mean of 12 hours and a standard deviation of 3
hours. Use the Empirical Rule to answer the following questions. a)
68% of the students spend between hours and hours on Statistics
each week. b) 95% of the students spend between hours and...

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 20
students, and the distribution of total study hours per week is
bell-shaped with a mean of 13 hours and a standard deviation of 3.4
hours.
Use the Empirical Rule to answer the following questions.
a) 68% of the students spend between ____ hours and ____ hours on
Statistics each week.
b) 95% of the students spend between...

A)Adult men have heights with a mean of 69.0
inches and a standard deviation of 2.8 inches. Find the height of a
man with a z-score of 0.8214 (to 4 decimal
places)
B)For a 4-unit class like Statistics, students
should spend average of 12 hours studying for the class. A survey
was done on 29 students, and the distribution of total study hours
per week is bell-shaped with a mean of 13 hours and a standard
deviation of 3.2 hours....

QUESTION 1:
We want to estimate the mean change in score µ in the
population of all high school seniors. An SRS of 430 high school
seniors gained an average of x¯¯¯x¯ = 22 points in their
second attempt at the SAT Mathematics exam. Assume that the change
in score has a Normal distribution with standard deviation
48.114.
Find σx¯¯¯σx¯, the standard deviation of the mean change
x¯¯¯x¯. (±±0.001).
Using the 68-95-99.7 Rule (Empirical Rule), give a 99.7%
confidence interval for μμ...

A simple random sample of 32 men from a normally distributed
population results in a standard deviation of 10.3 beats per
minute. The normal range of pulse rates of adults is typically
given as 60 to 100 beats per minute. If the range rule of thumb is
applied to that normal range, the result is a standard deviation
of 10 beats per minute. Use the sample results with a 0.10
significance level to test the claim that pulse rates of...

1. A sample size of 80 will be drawn from a population
with mean 20 and standard deviation 15. Find the probability that
x̄ will be between 18 and 21.
A) 0.6087 B) 0.5841 C) 0.1170 D) 0.2743
2. A certain car model has a mean gas mileage of 29
miles per gallon (mpg) with a standard deviation 5 mpg. A pizza
delivery company buys 47 of these cars. What is the probability
that the average mileage of the fleet...

A simple random sample of 31 men from a normally distributed
population results in a standard deviation of 7.2 beats per minute.
The normal range of pulse rates of adults is typically given as 60
to 100 beats per minute. If the range rule of thumb is applied to
that normal? range, the result is a standard deviation of 10 beats
per minute. Use the sample results with a 0.05 significance level
to test the claim that pulse rates of...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 9 minutes ago

asked 10 minutes ago

asked 24 minutes ago

asked 33 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago