Using an a = 0.04, a confidence interval for a population proportion is determined to be 0.45 to 0.55. For the same data, if a is decreased, the confidence interval for the population proportion O becomes wider. O uses zero margin of error. O remains the same. becomes narrower.

Q: n = 260 and X = 208, construct a 90% confidence interval for the population proportion, p. Give…

A: Given data,x=208n=260p^=xn=208260=45=0.80

Q: Which of the following will decrease the width of a confidence interval   I. Increasing the…

A: The confidence interval depends on the three factors: Confidence level: The width of the confidence…

Q: Suppose a 95% confidence interval for μ turns out to be (1,000, 2,100). To make more useful…

A: Given : 95% confidence interval for μ turns out to be (1,000, 2,100).

Q: The population mean of a set of data is unknown. The sample mean is 44, and the error bound for the…

A:

Q: Find the confidence interval for population correlation coefficient if  r = 0.2 and n= 625.

A: The provided information are: Sample correlation coefficient (r) = 0.2 Sample size (n) = 625 No…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given95% confidence interval N=361 x = 59.1 seconds. z= 4.9 SecondsFind the margin of error?

Q: Which of the following describes the function of a confidence interval? Select one: a. It uses a…

A: Given Options, a. It uses a sample mean to estimate the population mean b. It uses a population mean…

Q: A statistics practitioner took a random sample of 48 observations from a population whose standard…

A: sample size(n)=48 population standard deviation(σ)=25 Mean(x)=105

Q: If n = 330 and X = 264, construct a 95% confidence interval for the population proportion, p.

A: Ans#- From the provided information, Confidence level = 95% Sample size (n) = 330, x = 264 Sample…

Q: Construct the confidence interval for the population mean . C=0.98, x=15.3, = 10.0, and n=75

A: The Confidence Interval formula is X  ±  Z s √(n) Where: X is the mean Z is the Z-value…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A:

Q: Here are summary statistics for randomly selected weights of newborn girls: n = 250, x= 32.4 hg, s=…

A: The following information has been provided: The sample size is n=20. The sample mean is x¯=32.5.…

Q: Construct a confidence interval of the population proportion at the given level of confidence. X =…

A:

Q: A recent study of 25 students showed that they spend an average of $18.53 for gas per week. The…

A: Given: Sample size n = 25 Sample mean X = 18.53 Sample standard deviation s = 3

Q: let the variable T stand for a student t-distributed variable. find the following a. in a sample of…

A: The Student t-distribution is used to find the confidence interval.

Q: There is a population of test scores. You take a sample of 11 scores and use them to estimate the…

A: From the given information, Sample size (n) =11 Assuming population is normally distributed with…

Q: Suppose you compute a 96% confidence interval. What will happen to the confidence interval if you…

A: IF YOU DECREASE THE CONFIDENCE LEVEL FROM 96% T0 94%,DECREASES THE ERROR BOUND AND MAKES THE…

Q: Find a Confidence interval for the true Population Proportions if n = 30,        x = 75, and the…

A: From the given information, X=75 and n=30.

Q: Construct a 90% confidence interval for the mean when x̅=50 and there are 31 observations. Suppose…

A:

Q: Using an ? = 0.04, a confidence interval for a population proportion is determined to be 0.55 to…

A: Answer  Given  level of significance [α] =0.04 a confidence interval for a population proportion is…

Q: Find the 90% confidence interval for the difference in the means.

A:

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given information Sample size (n) = 49 Sample mean x̅ = 55.1 Standard deviation (s) = 4.8…

Q: (a) Find P(r = 0). (b) Find P(r ≥ 1) by using the complement rule.

A:

Q: Tina catches a 14-pound bass.  She does not know the population mean or standard deviation.  So she…

A: From the provided information, The data values are as follow: 9, 12, 13, 10 and 10 Sample size (n) =…

Q: If [0.64, 0.82] is a confidence interval for the population proporlion. Find the value of the point…

A:

Q: Find the confidence level and α for an 80​% confidence interval.

A: Given confidence level =80%

Q: Find z given a 94% confidence interval and a= 0.06. z = ?

A: Confidence level=94%

Q: Assume that a sample is being used to estimate a population mean . If n = 16, = 38, and s = 3, find…

A: Sample size n=16Sample mean=38Standard deviation=3

Q: t the confidence interval for the population mean. C=0.98, x=6.6, =0.8, and n=5

A: As the population standard deviation is known, we will use z distribution. At 98% confidence level,…

Q: The 95% confidence interval of the variance of a population is computed as (12.367,21.761).…

A: Given information: The 95% confidence interval for the variance of a population is (12.367, 21.761).…

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

A: In this case, we need to find the correct option for the given question.

Q: C. FIND t a n = 15 for the 98% confidence interval for the mean.

A: Given problem is :

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.