If a 90% confidence interval for the mean μ of a population is computed (using z)...
If a 90% confidence interval for the mean μ of a population is
computed (using z) from a random
sample of 25 subjects is found to be 42 ± 6.25. The population standard deviation σ is equal to:
Homework Answers
We have given,
90% confidence interval 42 ± 6.25
Margin of error =6.25
Z critical value for 90% confidence interval =1.645 (by using Z table)
Substitute known values into above formula
 |
Add Answer to:
If a 90% confidence interval for the mean μ of a population
is
computed (using z)...
Construct the indicated confidence interval for the population mean μ using the t-distribution
X6.2.9-TConstruct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed c = 0.90, x̅ = 12.9, s = 4.0, n = 9 The 90% confidence interval using a t-distribution is 6.2.17-T In a random sample of 26 people, the mean commute time to work was 34.8 minutes and the standard deviation was 7.2 minutes. Assume the population is normally distributed and use a t-distribution to construct a 98% confidence interval for the population mean μ...
Answers only is okay! Construct the indicated confidence interval for the population mean μ using the...
Answers only is okay! Construct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed. c=0.99, x=13.1, s=3.0, n= 6 Construct the indicated confidence interval for the population mean μ using the t-distribution. Assume the population is normally distributed. c=0.95, x=14.5, s=0.55, n= 15 Use the given confidence interval to find the margin of error and the sample mean. (12.7,19.9The sample mean is In a random sample of 18 people, the mean...
Construct a 90% confidence interval for the population mean, μ. Assume the population has a normal...
Construct a 90% confidence interval for the population mean, μ. Assume the population has a normal distribution and interpret. A sample of 15 randomly selected math majors has a grade point average of 2.86 with a standard deviation of 0.78. • You must show the shaded region. • Give the calculator keystrokes for how you got the critical value for the regions. • You must show the formula for the appropriate confidence interval, show the plugging in of values, then...
In order to form a 99.7% confidence interval for μ= the population mean, a sample of...
In order to form a 99.7% confidence interval for μ= the population mean, a sample of n = 36 was selected. The sample was found to have a mean of 6 and a standard deviation of 3. The multiplier is __________ .
10. Fill in the blank. In developing a 96% confidence interval estimate for some normal population...
10. Fill in the blank. In developing a 96% confidence interval estimate for some normal population mean μ, the population standard deviation σ was 10, The interval estimate was found to be 12.6 ±3.64. Had σ equaled 5, the interval estimate would be 12. Based on a sample of size n 21 drawn from a normal population, the sample mean and sample standard deviation are, respectively, 15.68 and 1.36. We use T-test to test Ho : μ 15 vs H1...
- The required sample size for the interval estimation of the population mean μ can be...
- The required sample size for the interval estimation of the population mean μ can be computed if we specify the population standard deviation σ, the value of zα/2zα/2based on the confidence level 100(1 − α)% and the desired margin of error E. A) True B) False - In stratified random sampling, the population is first divided up into mutually exclusive and collectively exhaustive groups, called strata. Then simple random samples are drawn from each stratum, which are proportional to...
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean,...
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean, based on the following sample size of n-6. 1, 2, 3, 4, 5, and 19 Change the number 19 to 6 and recalculate the confidence interval. Using these results, describe the effect of an outlier (that is, an extreme value) on the confidence interval. Find a 90% confidence interval for the population mean, using the formula or calculator. [ ] SHS (Round to two...
a. Find a 95% confidence interval for μ. b. What do you mean when you say...
a. Find a 95% confidence interval for μ.
b. What do you mean when you say that a confidence coefficient
is .90?
c. Find a 99% confidence interval for μ.
d. What happens to the width of a confidence interval as the
value of the confidence coefficient is increased while the sample
size is held fixed?
e. Would your confidence intervals of parts a and c be valid if
the distribution of the original population were not normal?
Explain.
A...
Construct the confidence interval for the population mean μ. Construct the confidence interval for the population...
Construct the confidence interval for the population mean μ.
Construct the confidence interval for the population mean μ 0.98, x: 5.9, σ: 0.6, and n: 44 A 98% confidence interval for μ is OD (Round to two decimal places as needed.)
1. A C level confidence interval is described as what? (3 points) Oan interval computed from...
1. A C level confidence interval is described as what? (3 points) Oan interval computed from a data sample by a method that has the probability C of producing an interval containing the true value of the parameter any interval within the margin of error O an interval with a margin of error C that is also correct C% of the time Oany interval that follows the 68-95-99.7 rules Oan interval computed from a data sample that guarantees that the...
10. Fill in the blank. In developing a 96% confidence interval estimate for some normal population mean μ, the population standard deviation σ was 10, The interval estimate was found to be 12.6 ±3.64. Had σ equaled 5, the interval estimate would be 12. Based on a sample of size n 21 drawn from a normal population, the sample mean and sample standard deviation are, respectively, 15.68 and 1.36. We use T-test to test Ho : μ 15 vs H1...
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean, based on the following sample size of n-6. 1, 2, 3, 4, 5, and 19 Change the number 19 to 6 and recalculate the confidence interval. Using these results, describe the effect of an outlier (that is, an extreme value) on the confidence interval. Find a 90% confidence interval for the population mean, using the formula or calculator. [ ] SHS (Round to two...
a. Find a 95% confidence interval for μ.
b. What do you mean when you say that a confidence coefficient
is .90?
c. Find a 99% confidence interval for μ.
d. What happens to the width of a confidence interval as the
value of the confidence coefficient is increased while the sample
size is held fixed?
e. Would your confidence intervals of parts a and c be valid if
the distribution of the original population were not normal?
Explain.
A...
Construct the confidence interval for the population mean μ.
Construct the confidence interval for the population mean μ 0.98, x: 5.9, σ: 0.6, and n: 44 A 98% confidence interval for μ is OD (Round to two decimal places as needed.)
1. A C level confidence interval is described as what? (3 points) Oan interval computed from a data sample by a method that has the probability C of producing an interval containing the true value of the parameter any interval within the margin of error O an interval with a margin of error C that is also correct C% of the time Oany interval that follows the 68-95-99.7 rules Oan interval computed from a data sample that guarantees that the...
Most questions answered within 3 hours.
-
2) You are given the task of finding a representation for a
circle in a drawing...
asked 18 minutes ago -
STUDY QUESTION: Does use of diet drug fen-phen
(fenfluramine-phentermine) cause valvular heart disease?
HINT: Valvular heart...
asked 10 minutes ago -
1. An object weighing 40 N rests on a surface. The coefficient
of friction is 0.35....
asked 1 hour ago -
Investor company owns 35% of investee company voting stock and
accounts for the investment under the...
asked 2 hours ago -
The number of major faults on a randomly chosen 1 km stretch of
highway has a...
asked 2 hours ago -
Consider the competitive environment of Starbuck's, Progressive
Insurance, a manufacturing firm with low turnover, or a...
asked 3 hours ago -
3. Gains from trade
Consider two neighbouring island countries called Euphoria and
Contente. They each have...
asked 5 hours ago -
A business executive has the option to invest money in two
plans: Plan A guarantees that...
asked 7 hours ago -
Hello, can someone please help me answer this question?
How much heat is absorbed by a...
asked 7 hours ago -
. A marketing researcher conducted a survey of 25 shoppers
randomly selected at the local mall...
asked 8 hours ago -
Create an comprehensive response to the
following:
Antimicrobial agents work on a multitude of microbes (bacteria,...
asked 8 hours ago -
6.13 LAB: Step counter. Section 6.3.
A pedometer treats walking 2,000 steps as walking 1 mile....
asked 8 hours ago