Question

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.

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

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What is the degrees of freedom (df)?

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

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What is the mean and standard deviation of the sample?

I recommend using Excel or a Scientific calculator for determining the mean and standard deviation of the data set. .

Enter the mean and standard deviation rounded to two decimal places in the order requested.

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Find a 90% confidence interval for the population mean.

Use the mean and standard deviation rounded to 2 decimal places in your calculations.

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.

2.

A person claims to be able to predict the outcome of flipping a coin. Their claim will be accepted if they can predict the outcomes of flipping a coin on average with a higher percentage that would occur by change, guessing (50%). Upon performing the experiment, the person is correct 18 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 point.  Do not enter your answer in percent.

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What is the sample size being used for calculating a confidence interval for the proportion of heads demonstrated base upon the reported data? Enter answer as an integer.

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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. Do not enter your answer in percent.

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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

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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.

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Answer 1

Please post the other questions separately. As per our answering guidelines we are supposed to answer just one question or four sub parts of the same question. Thank you.