3. Suppose that you are working for a watch company studying the average wrist sizes of...

3. Suppose that you are working for a watch company studying the average wrist sizes of people in the population of the United States.

(a) If you are told that we know from previous studies that the standard deviation in women’s wrist sizes is 0.5 inches, and from a random sample of 20 women, the sample mean wrist size was 7.2 inches, create a 95% confidence interval for the true mean wrist size.

(b) Your boss comes back and tells you that they found out that the sample actually had 30 women, but everything else was correct. Create a new 95% confidence interval based on this information.

(c) Your boss comes back and tells you that they made a mistake and the 0.5 inch standard deviation was actually just the sample standard deviation and we don’t know the true value. In addition, it turns out there were only 10 women in the study. After calming down, create a new 95% confidence interval based on this information.

Solutions

Expert Solution

orchestra answered 11 months ago

Next > < Previous

Related Solutions

You are studying for the first physics exam and forget to watch the time. The next...

You are studying for the first physics exam and forget to watch the time. The next morning you ignore your alarm clock until you realize you will not reach the bus unless you run as fast as you can to the bus station in 15min. Carrying your school books during the run results in a total energy use of 1200W. You start sweating, which is the way your body keeps you cool. a. Assume a typical efficiency how much would...

Suppose you are working in a networking company ‘A’. There is a company ‘B’ that is...

Suppose you are working in a networking company ‘A’. There is a company ‘B’ that is a competitor of your company. There is a big budget project called ‘Alpha’ that your company needs to get. However, the ‘Alpha’ team thinks both company ‘A’ and ‘B’ are suitable for handling the project. Therefore, in order to decide to which company they will give the project, they have come up with a simple task to evaluate their performance. After analyzing the situation,...

In studying the relationship between average daily temperature and time spent on a telephone, suppose you...

In studying the relationship between average daily temperature and time spent on a telephone, suppose you computed r=0.607 using n=31 data points. Using the critical values table below, determine if the value of r is significant or not.

Question 3 0 / 3 pts Suppose you are working with the automobile data set and...

Question 3 0 / 3 pts Suppose you are working with the automobile data set and got the following printout. Assume that you already tested the quadratic terms and dropped them out of the model. The following printout was created. Least Squares Linear Regression of Price Predictor Variables Coefficient Std Error T P VIF Constant 20339.7 1039.20 19.57 0.0000 0.0 Mileage -0.06642 0.02264 -2.93 0.0052 1.8 Model 1255.69 1454.48 0.86...

3. You are a researcher that is studying a population of trolls. You have been studying...

3. You are a researcher that is studying a population of trolls. You have been studying the trolls for many years and think that this population has some individuals that have some genetic abnormalities that could be the result of 1) DNA replication and repair errors, 2) chromatic packaging issues or 3) chromosomal mutations. These abnormalities seem to run in families and do not appear to be effected by seasonal or environmental changes but do cause the individuals to get...

3. A consumer watchdog group is studying the number of hours 10-year-olds watch television each day. ...

3. A consumer watchdog group is studying the number of hours 10-year-olds watch television each day. A random sample of 25 household containing at least one 10-year-old were surveyed. The parents were asked to record the number of hours the 10-year-old watched television on Saturday, including video games and YouTube. Mean number of hours watching Television was determined to be 6 and the population standard deviation is known to be 5 hours. What type of data are these? Explain. Can...

Suppose we are interested in studying flight delays. We know that on average there are 100...

Suppose we are interested in studying flight delays. We know that on average there are 100 delays in a month with a population standard deviation of 238 delays. Suppose we take a sample of 30 flight delays from American airlines only and we find that the average from that sample for that month is 306 delays. We are interested in seeing if the number of flight delays are increasing. What is the standard error? What is the margin of error...

Suppose you are working in an insurance company. You are required to estimate loss reserves. How...

Suppose you are working in an insurance company. You are required to estimate loss reserves. How you will estimate the loss reserves. What will be examples of methods that can be used for this purpose? What is the basis for each method? NO Plagiarism

Q2. Suppose you are working in an insurance company. You are required to estimate loss reserves....

Q2. Suppose you are working in an insurance company. You are required to estimate loss reserves. How you will estimate the loss reserves. What will be examples of methods that can be used for this purpose? What is the basis for each method?

Suppose that 20% of the subscribers of a cable television company watch the shopping channel at...

Suppose that 20% of the subscribers of a cable television company watch the shopping channel at least once a week. The cable company is trying to decide whether to replace this channel with a new local station. A survey of 100 subscribers will be undertaken. The cable company has decided to keep the shopping channel if the sample proportion is greater than 0.25. What is the approximate probability that the cable company will keep the shopping channel, even though the...

Subjects