Question

Asking 10 people how many siblings they have, results were as follow:

data set: 1, 3, 2, 0, 1, 1, 2, 3, 4, 1. n=10

Assume these data represent a random sample from an approximately normal population.

Compute the sample mean and sample standard deviation using technology (TI, JMP, excel, etc.).

Compute confidence interval (may be 80%, 90%, 95%, etc.) for the mean. Please interpret your confidence interval in the context of the problem.

Answer #1

The data below is the income for people who are married. Find
the 99% confidence Interval for the mean incomes for married
couples.
Incomes of married people
95835
110651
97663
110553
98491
115766
95706
99610
10235
1.
State and check the assumptions for confidence interval
2.
Method used to analyze data (TI calculator, web applet, or
excel
3.
Find Sample statistic and the confidence interval
4.
Statistical interpretation

55 randomly selected students were asked how many siblings were
in their family. Let X - the number of pairs of siblings in the
student's family. The results are as follows:
# of Siblings
0
1
2
3
4
5
Frequency
10
6
14
8
6
11
Round all your answers to one decimal place.
The mean is:
The median is:
The sample standard deviation is:
The first quartile is:
The third quartile is:
What percent of the respondents have...

Instructions: For this discussion, everyone in a prior class
told me how many siblings they have.
That data is in the chart (below). For example, if someone had
three siblings, then they put an X
in the row for Three Siblings. First, determine the frequency of
siblings. Then answer the
questions that follow/
Number of Siblings
Running Tally of Number of Siblings (Brothers and
Sisters) (Put a x each time the category applies)
Frequency
Zero (no) siblings xxxxxxxxxxx 11
One...

The data (below) represent a random sample of 9 scores (out of
100) on a midterm exam.
70 90 70 50 40 80 30 100 90
a. Find the sample mean and sample standard deviation.
b. Find the standard error of x bar
c. Assuming that the population distribution of scores is normal,
find a 95% confidence interval
for the true mean score.
d. Interpret your result in (c).
e. One claims that the true mean score is 90. Do...

Collect the Data
1. Survey
several (up to 30) students from Clemson University , asking them
if they were born in this state. Let X = the number that
were born in this state.
X= 17
N=13
1. Fill
in the blanks on the graph with the area in each section. Then,
fill in the number line with the upper and lower limits of the
confidence interval and the sample proportion.
8. Fill in the table:
Confidence Level
EBP
Confidence Interval
50%...

Noise levels at 3 volcanoes were measured in decibels yielding
the following data:
142,113,135
Construct the 90%90% confidence interval for the mean noise
level at such locations. Assume the population is approximately
normal.
Copy Data
Step 2 of 4:
Calculate the sample standard deviation for the given sample
data. Round your answer to one decimal place

Many people think it’s faster to order at the drive-thru than to
order inside at fast-food restaurants. To find out, two
students randomly selected 10 times over a 2-week period to visit a
local Dunkin’ Donuts restaurant. At each of these times,
one student ordered an iced coffee at the drive-thru and the other
student ordered an iced coffee at the counter
inside. The table shows the times, in seconds, that it
took for each student to receive their iced coffee after the...

The following measurements (in picocuries per liter) were
recorded by a set of ozone detectors installed in a laboratory
facility:
201.9,203.6,264.1,235.6,221.1 Using these measurements,
construct a 90% confidence interval for the mean level of ozone
present in the facility. Assume the population is approximately
normal.
Copy Data
Step 1 of 4:
Calculate the sample mean for the given sample data. Round your
answer to two decimal places.
Step 2 of 4:
Calculate the sample standard deviation for the given sample...

I have an original data set and 4 sets of transformed data to
which I applied a two-sample pooled variance t-procedure in R. I am
uncertain about to how to interpret the confidence intervals of the
transformed data since when I back-transform the endpoints by
undoing the original operation, I get values that don't seem
anywhere near correct. Each of the transformations that was applied
has been added as a suffix to the vector name containing the
transformed data (in...

Noise levels at 3 volcanoes were measured in decibels yielding
the following data:
149,163,157
Construct the 90% confidence interval for the mean noise level
at such locations. Assume the population is approximately
normal.
1. Find the critical value that should be used in constructing
the confidence interval. Round your answer to three decimal
places.
2. Find the upper and lower endpoints

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