Question: The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviation

The age when smokers first start from previous studies is normally distributed with a mean of 13 years old with a population standard deviation of 1.4 years old. A survey of smokers of this generation was done to estimate if the mean age has changed. The sample of 28 smokers found that their mean starting age was 14.5 years old. Find the 90% confidence interval of the mean.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

Content AreaThe ratio of cash to monthly cash expenses is computed as _____. a. cash divided by cash equivalents b. current assets divided by monthly cash expenses c. cash and cash equivalents...

The Giant Machinery has the current capital structure of 65% equity and 35% debt. Its net income in the current year is $250,000. The company is planning to launch a project that will requires an...

Part 1) Amount of Sleep A sleep study administered to U.S. adults showed that the amount of sleep (in hours) they get in a 24-hour period is normally distributed with a mean of 6.5 hours and a...

Presented below is information related to LeBron James Manufacturing Corporation. Instructions (a) Compute the rate of depreciation per year to be applied to the plant assets under the composite...

Jorrey Company manufactures bookcases. Direct materials standards are 20 board feet of lumber per bookcase at a cost of $ 2.50 per board foot. During the month of July, Jorrey purchased 25,000 board...

The table shows the yield y (in milligrams) of a chemical reaction after t minutes. (a) Use the regression capabilities of a graphing utility to find the least squares regression line for the data....

Compute the value of ????2???? ???????? for a multiple regression model ???? = ???? + ????1????1 + + ???????????????? + ???? when (a) ???????????? = 100, ???????????????????? = 27210, ???? = 100,...

The following is an excerpt (with dates changed) from Against the Grain, a series of recommendations by the State Comptroller of Texas as to how to save $4.5 billion and thereby balance the states...

3 . Computer Science / AI question. Adam, Barb, Camellia, and David are picking their entrees at a restaurant. The entrees are egg, falafel, granola, and hamburger. They have some strict dietary...

Following are the transactions of a new company. August 1M. Harris, the owner, invested $14,750 cash and $63,425 of photography equipment in the company in exchange for common stock. August 1 The...

Fitzgerald Industries has a new project available that requires an initial investment of $4.6 million. The project will provide unlevered cash flows of $835,000 per year for the next 20 years. The...

According to Dib (2022), "Sustainable aviation fuel production contributes to ending hunger and malnutrition by promoting resilient agricultural practices that improve productivity and output. The...

The post-closing trial balance at 30 June 2020 of Payneham Professional Services is shown below. Transactions completed during the year ended 30 June 2021 are summarised below: 1. Collections on...

A B C 1) An object moves along the line from point 1 to point 2 in time t. 2 a) Suppose that the object is speeding up. Which of the labeled points A, B, or C could correspond to the location of the...

Harry Hype has $5,000 to spend on advertising a new kind of dehydrated sushi. Market research shows that the people most likely to buy this new product are recent recipients of M.B.A. degrees and...

31. Xun, Yue and Zhuo have interests in XYZ Partnership. Partnership income for the year is $296,000. The partnership agreement specifies that Xun is to receive an annual salary of $200,000, Yue is...

Provide examples of a situations in which environmental disruptions affected consumer attitudes and buying behaviors.

31. What is the conditional probability that the first die is six given that the sum of the dice is seven?

9. We say that E F if every point in E is also in F. Show that if E F, then P(F) = P(E) + P(FEc ) P(E)

7. Show that (E F)c = EcFc.