A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within0.040.04 with9090​%confidence if​a) she uses a previous estimate of0.420.42​?​b) she does not use any prior​ estimates?

Q: An investigator wants to estimate the mean birth weight of infants born full term to mothers who are...

A: Part (A)The provided information are:Confidence level = 95% = 0.95So, significance level (alpha) = 1...

Q: An article in the Archives of Internal Medicine reported that in a sample of 224 men, 73 had elevate...

A: Here 224 men and 232 women are selected randomly. 73 of the men had elevated cholesterol levels, whe...

Q: Please show TI 84 steps

A: It is given that degrees of freedom is 11.

Q: Find k such that P(-k < Z < k) = .6970  it might help to sketch the situation

A: To value of k can be determine as:By using Z-table,

Q: 4. In which of the following cases OLS estimation of Healthcare=a+bAge+u will be biased? a) Only inc...

A: Explanation:A random sample helps avoid unnecessary bias.Random errors, such as random typing errors...

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of...

A: The probability that the average length of a randomly selected bundle of steel rods is less than 190...

Q: Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim.   A...

A: Given claim: An entomologist claims that fewer than 19 in ten thousand male fireflies are unable to ...

Q: Compute the critical value Zα/2 that corresponds to an 82​% level of confidence.   Zα/2 = ​(Rou...

A: It is given that the level of confidence is 0.82.

Q: A population of values has a normal distribution with μ=179 and σ=98.2. You intend to draw a random ...

A: The provided information are:Population mean (µ) = 179.Population standard deviation (σ) = 98.2Sampl...