Determine the 99.5 percent confidence interval that contains the population variance if the sample size is 20 and the population variance is 50.

Q: In order to construct a confidence interval on the difference between means, you need to assume that…

A: Solution: Assumptions for constructing a confidence interval on the difference between means are…

Q: Find the 95% confidence interval for the mean difference of the tests, and explain it.

A: Test - 1 (X) Test-2 (Y) (x-xbar) (x-xbar)^2 (y-ybar) (y-ybar)^2 1.2 1.4 -0.31111 0.09679 -0.24444…

Q: A 90% confidence interval for the population mean ?is 18 <u< 24, What is the sample mean

A:

Q: Determine the margin of error for the confidence interval for the proportion: 0.509<p<0.845 The…

A: The given confidence interval is about population mean. We have to find the margin of error. Margin…

Q: Use the given confidence interval to find the margin of error and the sample proportion. (0.704,…

A: The confidence interval for population proportion is given by (0.704, 0.732)

Q: Find a 90% confidence interval for the population mean, if the sample size is 58, the sample mean is…

A:

Q: When calculating the confidence interval for a population mean, which distribution is used?

A: Confidence interval for mean: When the sample size is large (n&gt;30) and population variance (or…

Q: Determine the margin of error for the confidence interval for the mean 68 < u < 85 The margin of…

A:

Q: Find the value of ta for a 99% confidence interval when sample size is 30 2

A: Note: Since you have asked multiple question, we will solve the first question for you as per…

Q: Is the difference between the two indicators significant at the 95% confidence level?

A:

Q: Suppose you had a sample size of 41 and the population distribution was normal. Which approach would…

A: Here we use basic criteria for getting best interval estimation of mean

Q: Determine the margin of error for the confidence interval for the mean: 21+1.2 The margin of error…

A: Confidence Interval formula for mean is given by, =&gt; (X bar + - z* sigma/√n) Where X bar is mean.…

Q: Suppose that you will be taking a random sample from a population and that you intend to find a 95%…

A: Solution: The confidence interval for the population mean is calculated by using the following…

Q: What is the confidence interval estimate for the population mean? If the sample mean is 13 and error…

A: Given information: The sample mean is, M = 13 The error bound for the mean is, E = 3.2 It is…

Q: using the confidence interval method, to test that population mean equals 14, a researcher obtains…

A: Solution: State the hypotheses. Null hypothesis: H0: µ=14. That is, the population mean is equal to…

Q: Find a 90% confidence interval for the mean of a normal distribution if population variance is 4 and…

A: Given CL = 0.90 Population variance, σ2=4 Sample size, n=8 9,14,10,12,7,13,11,12

Q: Determine the margin of error for the confidence interval for the proportion: 0.557 < μ< 0.837 The…

A: It is given that the confidence interval for proportion is as follows: 0.557 &lt; µ &lt; 0.837.

Q: What is the effect of sample size on the width of a confidence interval?

A: If the sample size is increased, then the corresponding margin of error is decreased. Hence, the…

Q: What is the margin of error for a 90% confidence interval?

A: It is given that Sample size n = 850 Number of residents support property tax, X = 410 The critical…

Q: Identify the t-score for a 90% confidence interval if the sample size is 31. t =

A: c1=90%n=31α=1-0.90=0.10df=n-1=31-1=30

Q: Suppose that you have obtained data by taking a random sample from a population and that you intend…

A: 95% percent confidence interval will give more accurate estimate of µ than 99% confidence interval.…

Q: Identify the y-score for a 99% confidence interval if the sample size is 35.

A: We have to find critical value for given data..

Q: onstruct a 95 confidence interval for p.

A: Here use confidence interval for proportion

Q: State the equation for the 95% confidence interval?

A: The equation for confidence interval can be stated as: Here x̅ is the sample mean, Zα/2 is the…

Q: The data represents a sample of the number of home fires started by faulty electrical wiring for the…

A: Given :Data points [20.0, 16.0, 27.0, 19.0, 18.0, 23.0, 24.0, 25.0] From Data points we get…

Q: if you increase the sample size and confidence level at the same time. what will happen to the width…

A: The formula for the confidence interval (say) for population mean is :  C.I= x ± zα/2.s2n As the…

Q: Suppose we know that a confidence interval for a population proportion is (0.572, 0.662), with a…

A:

Q: Identify the y-score for a 95% confidence interval if the sample size is 15.

A: The confidence level is 0.95.

Q: Assume that the population has a normal distribution. Thirty randomly selected students took the…

A:

Q: Construct a 90% confidence interval for the population variance.

A: 31

Q: The 95% confidence interval for the mean contains the sample mean with 95% certainty.TrueFalse

A: The confidence interval provides us a different range at different levels of significance. Since,…

Q: Indentify the t-score for a 95% confidence interval if the sample size is 50 t=

A: Given n=20 CI=95%

Q: identify the t-score for a 90% confidence interval if the sample size is 31.        t=

A:

Q: What value of z would you use to calculate the 98% confidence interval for a population mean, given…

A:

Q: find tc for a 95% confidence level when the sample size is 6.

A: level of significance, alpha = 0.05from standard normal table, two tailed t alpha/2 with n-1 = 6 d.f…

Q: Determine the margin of error for the confidence interval for the mean: 61<µ< 86 The margin of error…

A: Solution: From the given information, the confidence interval for the mean is 61&lt;µ&lt;86. Then,…

Q: What is the minimum required sample size to make a 96% confidence interval for a population mean if…

A: Margin of error=E=2 Standard deviation=σ=12 96% confidence interval  E=Zc×σ/√n n=sample size

Q: Which of the below is the correct calculation of the 95¥% confidence interval?

A: Given that sample size n = 670 And sample proportion = 0.85 The critical value of Z at 95%…

Q: A 90% confidence interval for a population mean is (10, 20). What is the margin of error of the…

A: Given  alpha=0.10,  CI=(10,20)

Q: For the same sample statistics, which level of confidence would produce the widest confidence…

A:

Q: Identify the at-score for a 99% confidence interval if the sample size is 70.

A: givensample size(n)=70α=1-0.99=0.01

Q: Determine the margin of error for the confidence interval for the mean: 23 +1.7 The margin of error…

A: Confidence Interval is an inference process that is used to estimate the population parameter. The…

Q: Construct a 99% confidence interval for the population proportion

A:

Q: Car and Driver Magazine tested a random sample of 9 hybrid cars and found their MPG to be 42, 51,…

A:

Q: What two conditions will result in the use of the student-t distribution when constructing a…

A: Confidence interval for mean: When the sample size is large (n&gt;30) and population variance (or…

Q: Determine the margin of error for the confidence interval for the mean: 16+1.5 The margin of error…

A: We have given confidence interval is- 16 ± 1.5 Since we know that, Confidence interval = the…

Q: For what type of variable does it make sense to construct a confidence interval about a population​…

A: Qualitative variable: A variable which cannot be measured in numerically is known as a Qualitative…