Why would manufacturers or businesses be interested in constructing a confidence interval for the population measure?  Would manufacturers or businesses want large or small margins of error

Q: When 99% confidence interval is calculated instead of a 95% confidence interval with the same sample…

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Q: Example: construct 95% confidence interval for a population mean, if a sample of size 9 gave X = 13…

A: Given :X¯=13S=3n=9confidence level = 95%Level of significance :α=0.05The formula for confidence…

Q: What is the formula for the 95% confidence interval for a population mean, given a sample mean and…

A: Given that 95% confidence interval for populations mean.

Q: Why does a decrease in sample size generally yield larger confidence intervals?

A: Confidence interval is the interval estimate of an unknown population parameter. It gives the…

Q: Which is true about a Z-score?   a.It identifies the confidence interval for a group of data. b.It…

A: A z-score describes the position of a raw score in terms of its distance from the mean, when…

Q: How do I calculate a 95% confidence level for a sample proportion in excel? Meaning, what formula…

A: Given : Confidence level = CL = 95% = 0.95

Q: Explain which would result in a wider large-sample confidence interval for : a 90%pconfidence level…

A: The z critical value for 95% confidence interval is 1.96 and the z-critical value for 90% confidence…

Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

Q: Define a confidence interval or margin of error and discuss the impact of sample size at it…

A: Let's define true population mean CI for a sample of size n (n<30) x¯±tsnwhere s=sample standard…

Q: What are two ways to get a narrower confidence interval for a proportion?

A: Two ways to get a narrower confidence interval for a proportion are:

Q: Sam computed a 90% confidence interval for mean from a specific random sample size n. He claims that…

A: Given Information: Sam computed a 90% confidence interval for mean from a specific random sample of…

Q: According to a poll, 81% of California adults (411 out of 506 surveyed) feel that education is one…

A: The point estimate of population proportion is sample proportion.   Total number of California…

Q: What effect does increasing the sample size have on the width of a confidence interval? I know that…

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Q: How can we interpret a 95% confidence interval?

A: How to interpret a 95% confidence Interval?  We know that,  Confidence Interval is defined as the…

Q: A survey showed 980 of 1500 adult respondents believe in global warming. Construct a 95% confidence…

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Q: A poll of 2500 people shows that 50% approve of a smoking ban in bars and restaurants in Kentucky.…

A: Given, n = 2500 p = 50% = 0.50 At 95% Confidence level, the value of Z is 1.96

Q: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

Q: When we comparing the hospitals in our area for seeking a better care, what statistics or data we…

A: It is an important part of statistics. It is widely used.

Q: Suppose you want to construct an 80% confidence interval for the proportion of businesses that…

A: Given:Margin of Error (E)=3.5%=0.035   For Confidence level 80%, the significance level (α) is…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.