Question

An
engineer measure 4 different pressures, 90, 98, 95 and 99 psi. What
is the standard deviation of these measurments?

Answer #1

The measurements are 90 , 98 , 95 and 99 psi. We have to find the mean first.

= x / n

= (90 + 98 + 95 + 99) / 4

= 95.5

The standard deviation ={ (x - )2/ n}

= (49/4)

=(12.25)

= 3.5

standard deviation = 3.5 psi

An engineer measure 4 different pressures, 91, 99, 91 and 95
psi. What is the standard deviation of these measurments?

Question 1: Solve all of the above
Note: Absloute answers with 4 digits ex:
1.1234
A) An engineer measure 4 different pressures, 91, 99, 91 and 95
psi. What is the standard deviation of these measurments?
[ ]
B) A UJ student drives every day from his home to his
university. Time to reach university is distributed normally with a
mean of 50 minutes and with standard deviation of 12 minutes. Find
the probability that the time to reach university...

A researcher computed 90%, 95%, 98% and 99% confidence intervals
for a population mean. However, he forgot to record which interval
was which, and he cannot find the sample data to allow him to
recreate the intervals from scratch. He now needs only the 99%
confidence interval. Which one is it?
a-(37.9, 42.1)
b-(38.4, 41.6)
c-(38.1, 41.9)
d-(38.7, 41.3)

80%
90%
95%
98%
99%
Mean
70611.96
70611.96
70611.96
70611.96
70611.96
Z score
1.28
1.64
1.96
2.33
2.58
Standard Error
1516.38
1516.38
1516.38
1516.38
1516.38
Margin of Error
1943.32
2494.22
2972.05
3527.63
3905.93
Lower CI
68668.64
68117.74
67639.91
67084.34
66706.03
Upper CI
72555.28
73106.18
73584.01
74139.59
74517.90
What trend do you see takes place to the confidence interval as
the confidence level rises? Explain mathematically why that takes
place.

1. Develop 90 %, 95 %, and 99% confidence intervals for
population mean (µ) when sample mean is 10 with the sample size of
100. Population standard deviation is known to be 5.
2. Suppose that sample size changes to 144 and 225. Develop
three confidence intervals again. What happens to the margin of
error when sample size increases?
3. A simple random sample of 400 individuals provides 100 yes
responses. Compute the 90%, 95%, and 99% confidence interval for...

Calculate the 99%, 95%, and 90% confidence intervals for the
following information. Identify how these confidence intervals are
similar and how they are different. Explain why. (70
points)
µ = 89 σ = 9 n = 121
The 99% Confidence Interval:
The 95% Confidence Interval:
The 90% Confidence Interval:
Similarities:
Differences:
Why?

If a mean is 27 and the standard deviation is 16.4 , 68%, 95%,
and 99& of the scores fall between what?

Construct 90%, 95%, and 99% confidence intervals to estimate μ
from the following data. State the point estimate. Assume the data
come from a normally distributed population. 13.3 11.6 11.9 12.2
12.5 11.4 12.0 11.7 11.8 13.3
(Round the intermediate values to 4 decimal places. Round your
answers to 2 decimal places.)
90% confidence interval: enter the lower limit of the 90%
confidence interval ≤ μ ≤ enter the upper limit
of the 90% confidence interval
95% confidence interval: enter the...

Construct 90%, 95%, and 99% confidence intervals to estimate μ
from the following data. State the point estimate. Assume the data
come from a normally distributed population. 13.7 11.6 11.9 13.0
12.5 11.4 12.0 11.7 11.8 13.7 Appendix A Statistical Tables (Round
the intermediate values to 4 decimal places. Round your answers to
2 decimal places.) 90% confidence interval: enter the lower limit
of the 90% confidence interval ≤ μ ≤ enter the upper limit of the
90% confidence interval...

Construct 90%, 95%, and 99% confidence intervals to estimate μ
from the following data. State the point estimate. Assume the data
come from a normally distributed population. 13.1 11.6 11.9 12.0
12.5 11.4 12.0 11.7 11.8 13.1 Appendix A Statistical Tables (Round
the intermediate values to 4 decimal places. Round your answers to
2 decimal places.) 90% confidence interval: enter the lower limit
of the 90% confidence interval ≤ μ ≤ enter the upper limit of the
90% confidence interval...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 10 minutes ago

asked 10 minutes ago

asked 10 minutes ago

asked 13 minutes ago

asked 25 minutes ago

asked 25 minutes ago

asked 29 minutes ago

asked 41 minutes ago

asked 55 minutes ago

asked 1 hour ago

asked 1 hour ago