Use SALT to find the multiplier t* for calculating a confidence interval for a single population mean in each of the following situations. (Round your answers to two decimal places.) (a) n = 29; confidence level = 0.95 (b) n = 71; confidence level = 0.95 (c) n = 1,001; confidence level = 0.98

A soft drink manufacturer wishes to know how many soft drinks teenagers drink each week. They want to construct a 98% confidence interval for the mean and are assuming that the population standard deviation for the number of soft drinks consumed each week is 1.3. The study found that for a sample of 2549 teenagers the mean number of softdrinks consumed per week is 5.4 . Construct the desired confidence interval round your answers to one decimal place.

Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from $2.88 to $4.11. Use the fact that the confidence interval for the mean is in the form x − E to x + E to compute the sample mean and the maximal margin of error E. (Round your answers to two decimal places.) x = $   E = $

5..

Using an α = 0.05, a confidence interval for a population proportion is determined to be 0.65 to 0.75. If the level of significance is decreased, the interval for the population proportion _____.

Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from $3.37 to $3.60. Use the fact that the confidence interval for the mean is in the form x − E to x + E to compute the sample mean and the maximal margin of error E. (Round your answers to two decimal places.) x = $   E = $

True or False: QUESTION 22 1. If a 95% confidence interval for the difference in two independent means is (-4.5 to 2.1), then the point estimate is -2.1.

Assume that we want to construct a confidence interval. Do one of the​ following, as appropriate.​ (a) Find the critical value zα/2​, ​(b) find the critical value tα/2​, or​ (c) state that neither the normal nor the t distribution applies.   Confidence level is 95​%, σ=23.5​, and the histogram of​ right-eye vision mea surements from a random sample of 52 adult males is shown to the right.           05010015020001020304050Vision in Right EyeFrequency         A histogram has a horizontal axis labeled "Vision in Right Eye" from 0 to greater than 200 in increments of 25 and a vertical axis labeled Frequency from 0 to 50 in increments of 10. The histogram contains vertical bars of width 25, where each vertical bar is centered over a horizontal axis tick mark. The heights of the three vertical bars are as follows, where the horizontal axis value is listed first and the height is listed second: 25, 37; 50, 14; 200, 1.       Select the correct choice below​ and,…

see below