The La Leche Society has released an educational video on the benefits of breast feeding. Prior to the release of the videos, it was known that 75% of new moms breast-feed exclusively for the first six weeks of their child's life. The CEO wants to know if the videos are increasing this proportion. A random sample of 400 new moms was obtained and 320 breast-fed their new babies exclusively for the first six weeks. At the 5% significance level, what conclusion can be reached?

Q: what is measured by a confidence interval and describe the factors that affect the width of a…

A: How much ambiguity there is for any given statistic is a confidence interval. Confidence intervals…

Q: to interpret our confidence inter

A: Given: Assumed confidence level = 0.95 Sample size (n) = 40 The given dataset is 299000 75000…

Q: Why do we need to compute a confidence interval rather than simply stating a point estimate

A: Whenever we discuss the estimation of an unknown parameter, there is a need for a confidence…

Q: What is a Confidence Level? what is one example of the use of the Confidence Interval?

A: A level of confidence refers to the percentage of all possible samples which the true population…

Q: he confidence interval was (73, 83) What was the point estimate? What was the margin of error?

A: Given: Lower limit =73 Upper limit =83 The point estimate can be calculated as: Point estimate…

Q: What is the impact of increasing the confidence level for a confidence interval? Makes the interval…

A: We are assuming that all other things are constant.   Confidence Interval is range that contains all…

Q: Find a credible journal article or website where confidence intervals were used to make informed…

A: From the given information we find the solution.

Q: (b) Assume that the mean score for students taking traditional courses is 5.60. A college that…

A: The mean score for students taking traditional curses is 5.60.

Q: What will happen other things being equal if you increase the confidence level for a given…

A: The objective of the question is to understand the impact of increasing the confidence level on the…

Q: Determine from a confidence interval whether a test is significant?

A: Null hypothesis states that there is no difference between populations or a set of given…

Q: What is the proper interpretation of a confidence interval for the difference in two proportions…

A: The confidence interval for the difference in the two proportions that has a negative number and a…

Q: Instruct a 95% confidence interval to estimate the pulation proportion with a sample proportion al…

A: Given that  Sample proportion p^=0.60 Sample size n =150

Q: The confidence interval was (22, 26) What was the point estimate? What was the margin of error?

A: Given confidence interval was (22, 26)

Q: Suppose a random sample of 50 basketball players showed the average height to be 78 inches. Also,…

A: From the provided information, Population standard deviation (σ) = 1.5 Sample mean (x̄) = 78 Sample…

Q: What is the difference between confidence interval of population and a population proportion

A: A confidence interval is a type of estimate computed from the statistics of the observed data. This…

Q: Iwo sampies are inaepenaent simpie ranaom sampies seiectea trom normainy distributed populations,…

A: The null and alternative hypotheses are: Here, µ1 is the mean treatment, and µ2 is the mean placebo.…

Q: How are z and t confidence intervals different? Choose one interval and give an example of how it…

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

Q: Explain when you would use the z value or the t-value to calculate a confidence interval

A: Z value: The z value is used for finding the confidence intervals for single population proportion,…

Q: What are confidence intervals?

A:

Q: What is the difference between a prediction interval and a confidence​ interval? And when is it…

A: Confidence Interval :  Confidence intervals tell you how well you have determined a parameter of…

Q: The National Center for Education Statistics reported that 47% of college students work to pay for…

A:

Q: What is the effect on the size of the confidence interval if a T score is used instead of a Z score?…

A: The formula for calculating confidence interval using Z score is as follow:

Q: What happens to the width of a confidence interval as the significance level, a, decreases?

A: There is two things Significance level: which is the prefixed probability of type I error before any…

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.