Question 1

Some experts claim that the length of time people live in a house can be described by a Normal distribution with a mean of 7.2 years and a standard deviation of 2.4 years.Suppose you calculate the percentage of homeowners who stay in their house for more than 9 years and the probability that the mean length of time for a sample of 100 homeowners is more than 9 years.If the correct model for the length of time people live in a home is in fact skewed to the right,does that change your answer to either calculation? Explain.

Accepted Answer

The answer of Some experts claim that the length of...

Question 2

A sample is chosen randomly from a population that was strongly skewed to the right.Describe the sampling distribution model for the sample mean if the sample size is small.
A)Skewed right,centre at μ,standard deviation σ/

B)Normal,centre at μ,standard deviation

C)There is not enough information to describe the sampling distribution model.
D)Normal,centre at μ,standard deviation σ/

E)Skewed right,centre at μ,standard deviation

Accepted Answer

The answer of A sample is chosen randomly from a...

Question 3

A hair stylist believes the distribution of her tips is Normal,with a mean of $10.50 and a standard deviation of $6.25.What is the probability that her 15 clients this weekend will tip an average of less than $13?
A)0.0377
B)0.9394
C)0.4000
D)0.0606
E)0.6000

Accepted Answer

The answer of A hair stylist believes the distribution of...

Question 4

Some experts estimate that the length of time people live in a house has a mean of 7.3 years and a standard deviation of 2.2 years.Explain why you could estimate the probability that 100 people selected at random had lived in their houses for an average of 9 years or more,but you could not estimate the probability that an individual had done so.

Accepted Answer

The answer of Some experts estimate that the length of...

Question 5

A zoo offers several levels of membership,as shown in the table.  
If we select a random sample of 50 zoo members,would you expect their membership charges to follow a Normal model? Explain.

Accepted Answer

The answer of A zoo offers several levels of membership,as...

Quiz 17: Sampling Distribution Models

A sample is chosen randomly from a population that was strongly skewed to the right.Describe the sampling distribution model for the sample mean if the sample size is small.

A hair stylist believes the distribution of her tips is Normal,with a mean of $10.50 and a standard deviation of $6.25.What is the probability that her 15 clients this weekend will tip an average of less than $13?

A zoo offers several levels of membership,as shown in the table. If we select a random sample of 50 zoo members,would you expect their membership charges to follow a Normal model? Explain.