You were interested in how long the average psychology major atyour college studies per night, so you asked 10 psychology majorsto 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 confidenceinterval?

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 fordetermining the mean and standard deviation of the data set. .

Enter the mean and standard deviation rounded to two decimalplaces 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 placesin your calculations.

Enter the lower number for the confidence interval first and theupper 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 acoin. Their claim will be accepted if they can predict the outcomesof flipping a coin on average with a higher percentage that wouldoccur by change, guessing (50%). Upon performing the experiment,the person is correct 18 out of 25 times. Answer the followingquestions based upon the above experiment.

What is the point estimate for the proportion of times theperson predicted the coin flips correctly?
Enter answer as a fraction or a 2 place decimal with a zero to theleft of the decimal point.  Do not enter your answer inpercent.

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

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Compute a 95% confidence interval for the proportion of timesthe person predicted the coin flips correctly. Enter the lowernumber and the upper number for the confidence interval with thelower number first. Enter answer as a decimal rounded to 3 decimalplaces with a zero to the left of the decimal point. Do not enteryour answer in percent.

____________

What conclusion can you draw from the confidence interval aboutthe ability of the person to predict the outcome of a coinflip?

Select the correct answer and enter the letter that isassociated with that answer.

a Based upon the data, the calculated conference intervalsupports the claim that the person flipping the coins can predictthe outcomes.
b Based upon the data, the calculated conference interval does notsupport the claim that the person flipping the coins can predictthe outcomes.
c     There is insufficient information to drawany conclusion from the experimental results

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What number must the lower number in the confidence intervalexceed in order for the confidence interval to support the claim ofbeing able to predict the outcome of flipping a coin?

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

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