## (solution) Question 1 20 / 20 points David Lane: Page 364 Exercise 4 Is a

I need answers on the attached document for STATS 200.  Thank You!

Question 1 20 / 20 points David Lane: Page 364 Exercise 4 Is a 99% confidence interval wider than a 95% confidence interval?

Question options: Yes. In order to be more confident that an interval contains the true

population mean you must increase the confidence interval width. No. The width of a confidence interval depends on two controllable

parameters, the sample size (n) and the confidence level (z or t). You can

increase the confidence level and maintain the same interval width by

increasing the sample size by an appropriate mount. No. Confidence level and Confidence width are independent of each other

and there is no relationship between the confidence level and the confidence

width.

Question

2 20 / 20 points Illowsky: Page 450 Exercise 100 What is meant by the term ?90% confident? when constructing a confidence interval for

a mean?

Question options: If we took repeated samples, approximately 90% of the samples would

produce the same confidence interval. If we took repeated samples, approximately 90% of the confidence intervals

calculated would contain the sample mean.

If we took repeated samples, approximately 90% of the confidence intervals

calculated would contain the true value of the population mean. If we took repeated samples, the sample mean would equal the population

mean in approximately 90% of the samples.

Question

3

David Lane: Page 365 9.6 / 20 points

Exercise 15 You take a sample of 22 from a population of test scores. The mean of your sample is

60 and the population standard deviation is 10.

What is the point estimate for the population mean?

___46___ What is the 99% confidence interval for the population mean?

Enter the lower number of the conference interval for the first number and the upper

number of the conference interval for the second number.

Enter each number rounded to 1 decimal place.

___54.5___

___65.4___ Assume you do not know the population standard deviation. The sample standard

deviation is 10.

What is the new 99% confidence interval on the mean?

Enter the lower number of the conference interval for the first number and the upper

number of the conference interval for the second number.

Enter each answer rounded to 1 decimal place.

___31.7___

___88.3___ What distribution did you use when computing the first confidence interval?

What is the degrees freedom for calculating the confidence interval?

Answer the question by selecting the proper letter a, b, c or d.

Enter 0 for the degrees freedom if degrees freedom is no applicable for the distribution

being used.

a The Normal distribution b The t distribution c The Uniform distribution d Neither of the above distributions ___a___

___0___ What distribution did you use when computing the second confidence interval?

What is the degrees freedom for calculating the confidence interval?

Answer the question by selecting the proper letter a, b, c or d.

Enter 0 for the degrees freedom if degrees freedom is no applicable for the distribution

being used.

a The Normal distribution b The t distribution c The Uniform distribution d Neither of the above distributions ___b___

___0___ Question 4

David Lane: Page 366 8 / 20 points

Exercise 18 You were interested in how long the average psychology major at your college studies

per night, so you asked 10 psychology majors to tell you the amount time they study.

You were given the following 'study times': 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4.

The average study time from the above data (Xbar) is 2.25

The standard deviation of the 'study times' from the above data is 1.11

(You should be able to verify the mean and standard deviation of the above data by

using an appropriate formulas and/or an Excel spreadsheet.)

What is the appropriate distribution for finding a confidence interval?

Select the correct answer and enter the appropriate letter.

a Uniform distribution b Normal distribution c t distribution d Chi Square distribution ___c___ What is the degrees of freedom (dF)?

If the question is inappropriate for the distribution selected enter the number 0.

___9___ Find a 95% confidence interval on the population mean. Enter the lower number for the confidence interval first and the upper number for the

confidence interval next.

Enter each number rounded to 2 decimal places.

___1.59___

___2.90___ Find a 90% confidence interval for the population mean.

Enter the lower number for the confidence interval first and the upper number for the

confidence next.

Enter each number rounded to 2 decimal places.

___1.70___

___2.79___ Question 5 4 / 20 points David Lane: Page 365 Exercise 12

A person claims to be able to predict the outcome of flipping a coin. The person is

correct 16 out of 25 times. Answer the following questions based upon the above

experiment.

What is the point estimate for the proportion of times the person predicted the coin flips

correctly?

Enter answer as a fraction or a 2 place decimal with a zero to the left of the decimal

___0.6___ What is the sample size being used for calculating a confidence interval for the

proportion of heads demonstrated base upon the reported data?

___25___ Compute a 95% confidence interval for the proportion of times the person predicted the

coin flips correctly.

Enter the lower number and the upper number for the confidence interval with the lower

number first.

Enter answer as a decimal rounded to 3 decimal places with a zero to the left of the

decimal point.

___0.45___

___0.83___ What conclusion can you draw from the confidence interval about the ability of the

person to predict the outcome of a coin flip?

Select the correct answer and enter the letter that is associated with that answer.

a Based upon the data, the calculated conference interval supports the claim that the

person flipping the coins can predict the outcomes.

b Based upon the data, the calculated conference interval does not support the claim

that the person flipping the coins can predict the outcomes.

c There is insufficient information to draw any conclusion from the experimental

results

___a___ What number must the lower number in the confidence interval exceed in order for the

confidence interval to support the claim of being able to predict the outcome of flipping a

coin?

Enter answer to 1 decimal place with a 0 to the left of the decimal point.

___1___

Solution details:
STATUS
QUALITY
Approved

This question was answered on: Jan 30, 2021 Solution~0001000090.zip (25.37 KB)

This attachment is locked

We have a ready expert answer for this paper which you can use for in-depth understanding, research editing or paraphrasing. You can buy it or order for a fresh, original and plagiarism-free solution (Deadline assured. Flexible pricing. TurnItIn Report provided)

##### Pay using PayPal (No PayPal account Required) or your credit card . All your purchases are securely protected by .

STATUS

QUALITY

Approved

Jan 30, 2021

EXPERT

Tutor 