Question

Please explain step by step.

The following data represents the GPA of a sample of 15 students
enrolled in a history class.

3.4, 3.9, 4.0, 2.8, 3.5, 2.6, 3.2, 3.6, 1.9, 2.1, 2.0, 3.3, 2.4,
1.8, 3.2

(a) Find the first quartile. Do not include the median in the
calculations.

Answer: __________________

(b) Find the third quartile. Do not include the median in the calculations.

Answer: __________________

(c) Find the mean.(Round to 2 decimal places.)

Answer: __________________

(d) Find the median.

Answer: __________________

(e) Find the mode.

Answer: __________________

(f) Find the range.

Answer: __________________

(g) Find the interquartile range (IQR).

Answer: __________________

(h) How many outliers are there in this data set?

Answer: __________________

Answer #1

Data shows the times for carrying out a blood test at
Rivervalley Labs
Using Excel Plot a histogram of the data. What type of
distribution does the data appear to follow?
Construct and interpret the 95% confidence interval for the
population mean time for carrying out a blood test. Assume that the
population standard deviation is unknown.
Times for blood tests (minutes)
2.5
4.9
3.6
4.3
1.9
3.4
3.2
4.0
3.1
3.6
3.9
4.4
3.9
3.1
2.7
3.5
3.6
3.7...

–Construct a reasonable frequency distribution of High School
GPA (HSGPA)
–Construct a histogram
–Present the frequency distribution and histogram
There are a total of 188 HS student GPAs.
1.6, 2, 2.1, 2.1, 2.2, 2.2, 2.2, 2.4, 2.4, 2.5, 2.5, 2.5, 2.5,
2.5, 2.6, 2.7, 2.75, 2.75, 2.75, 2.75, 2.75, 2.8, 2.8, 2.8, 2.9,
2.9, 2.9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3.1, 3.1, 3.1, 3.2, 3.2, 3.2,...

The
following data set contains the college GPA of a sample of ten
randomly selected UWG professors:
1.8, 2.1, 2.3, 2.5, 2.6, 3.2, 3.4, 3.7, 3.9, 4
A.) Construct a normal probability plot of the data set. Do
the GPA’s appear to be normally distributed? Yes or No.
B.) Find the critical t value that corresponds to a 90%
confidence level for the data rounded to 2 decimal places.
C.) Construct a 90% confidence interval for the mean GPA of...

A researcher wants to know if the clothes a woman wears is a
factor in her GPA. The table below shows data that was collected
from a survey.
Shorts
Dress
Jeans
Skirt
3.9
2.6
2.7
3.4
2.1
2.6
1.8
3.5
2.4
2.3
3
3.5
2
2.1
4
3.8
3.7
2.6
2.3
3.2
2.5
2.6
2.8
3.5
3.6
1.9
2.9
2.9
2.2
2.3
2.2
2.1
2.7
3.5
Assume that all distributions are normal, the four population
standard deviations are all the...

Listed in the accompanying data table are student evaluation
ratings of courses and professors, where a rating of 5 is for
"excellent." Assume that each sample is a simple random sample
obtained from a population with a normal distribution.
a. Use the 93 course evaluations to construct a 98%
confidence interval estimate of the standard deviation of the
population from which the sample was obtained.
b. Repeat part (a) using the 93 professor
evaluations.
c. Compare the results from part...

A sociologist claims that children spent more time watching
television in 1981 than children do today. A study was conducted in
1981 to find the time that children watched television on weekdays.
Recently, a similar study was conducted. The results of these
studies (in hours per weekday) are shown below. Assume the
population standard deviation is 0.7 for 1981 and 0.7 for today. At
Î±=0.05, can you support the sociologist's claim?
Complete parts (a) through (d) below.
1981
3.2
1.4...

A sociologist claims that children spent more time watching
television in 1981 than children do today. A study was conducted in
1981 to find the time that children watched television on weekdays.
Recently, a similar study was conducted. The results of these
studies (in hours per weekday) are shown below. Assume the
population standard deviation is 0.8 for 1981 and 0.6 for today. At
α=0.05, can you support the sociologist's claim? Complete parts (a)
through (d) below.
1981
1981
2.5...

For the data :
165 168 158 157 171 161 160 167 166 172
160 162 154 157 161 154 155 158 161 155
164 166 156 161 151 183 157 155 158 159
161 155 166 155 158 152 175 167 164 156
155 158 150 162 163 167 157 154 155 163
a. Find the mean, median and mode.
b. Find the range, variance, and standard deviation.
c. Find the lower quartile, upper quartile, and inter-quartile
range. Are...

For the data :
165 168 158 157 171 161 160 167 166 172
160 162 154 157 161 154 155 158 161 155
164 166 156 161 151 183 157 155 158 159
161 155 166 155 158 152 175 167 164 156
155 158 150 162 163 167 157 154 155 163
a. Find the mean, median and mode.
b. Find the range, variance, and standard
deviation.
c. Find the lower quartile, upper quartile, and
inter-quartile range. Are...

The data show the distance (in miles) from an airport of a
sample of 22 inbound and outbound airplanes. Use technology to
answer parts (a) and (b).
a. Find the data set's first, second, and third quartiles.
b. Draw a box-and-whisker plot that represents the data
set.
4.5
3.1
5.4
5.3
3.4
4.4
4.2
2.3
4.8
3.7
4.5
4.4
3.3
2.2
1.9
2.1
4.5
4.1
3.6
4.2
2.4
3.5
a. Find the three quartiles.
Q1=
Q2=
Q3=

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