An economist found that a random sample of 45 high school teachers had an average annual salary of $58,230.  A previous study showed that the population standard deviation is $4450. Find the 90% confidence interval for µ, the average annual salary of all high school teachers. A.  (54607.2 , 58372.8)  B. (56929.8 , 59530.2)  C. (54837.9 , 58142.1)  D. (57138.3 ,  59321.2)

53.305) B. (24.591, 35.563) C. (26.591, 37.563) D. (28.591, 39.563) 34. A simple random sample of size n = 36 is taken from a normally distributed original population. The sample standard deviation iss = 7. Find the 99% confidence interval for the population variance o2. A. (27.453, 98.756) B. (28.453, 99.756) C. (29.453, 100.756) D. (30.453, 101.756)

A sample of 20 bags of mulch had a mean weight of 52 pounds with a standard deviation of 3.8 pounds. Find the 95% confidence interval of the true mean. Show all your work for or explain how you obtained your answer in the space provided below.

A single burger contains a mean of 100 g of cooked beef with a standard deviation of 5 g. The restaurant owner claims that new triple burger contains three times as much beef. The table shows a sample of masses from 30 triple burgers. Does the sample support the claim at a 95% confidence level? Triple Burger Beef Mass (g) 292 297 295 290 290 294 291 296 282 291 289 291 290 292 295 289 289 294 298 292 294 295 285 297 296 287 302 289 290 290

In a random sample of 166 recent college graduates majoring in social sciences, theaverage starting salary was $63,700. The population standard deviation is $2410. Give a99% confidence interval for the average starting salary of college graduates majoring inthe social sciences

Suppose a randomly selected sample of n = 69 men has a mean foot length of x = 28.3 cm, and the standard deviation of the sample is 3 cm. Calculate an approximate 95% confidence interval for the mean foot length of men. (Round the answers to one decimal place.) to cm

From a sample with n = 32, the mean duration of a geyser's eruptions is 3.42 minutes and the standard deviation is 1.12 minutes. Using Chebychev's Theorem, determine at least how many of the eruptions lasted between 1.18 and 5.66 minutes. At least of the eruptions lasted between 1.18 and 5.66 minutes. (Simplify your answer.)

An economist found that a random sample of 45 high school teachers had an average annual salary of $58,230.  A previous study showed that the population standard deviation is $4450. Calculate the margin of error, E, for a 90% confidence interval for µ, the average annual salary of all high school teachers. A. $1488.6  B. $1300.2  C. $1652.1  D.$1091.2

A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 115 students who averaged 34.2 texts per day. The standard deviation was 23.3 texts. a. To compute the confidence interval use a     distribution. b. With 90% confidence the population mean number of texts per day is between  and   texts. c. If many groups of 115 randomly selected members are studied, then a different confidence interval would be produced from each group. About  percent of these confidence intervals will contain the true population number of texts per day and about  percent will not contain the true population mean number of texts per day.

In a random sample of ten people, the mean driving distance to work was 25.5 miles and the standard deviation was 7.3 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean μ. Interpret the results. Identify the margin of error. (Round to one decimal place as needed.) Construct a 90% confidence interval for the population mean. (...) (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) OA. % of all random samples of ten people from the population will have a mean driving distance to work (in miles) that is between the interval's endpoints. OB. It can be said that % of the population has a driving distance to work (in miles) that is between the interval's endpoints. OC. With % confidence, it can be said that most driving distances to…