Show your work. Be neat.

1. Find mean and margin of error if 28.6 < µ < 38.8

2. Find margin of error and critical values (Z-a/2) for sample of 36 objects with mean 65 and standard deviation 6.0. Use 95% confidence interval.

3. Find critical value (t- a/2 ) that corresponds to a confidence level of 95% and sample size n=14

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4. Find margin of error and confidence interval for the population mean µ of the college graduates who have taken the statistics course if average value for sample of 25 objects is 52,642 and sample standard deviation S=10,830 . Use 95% confidence interval. (Use t-distribution)

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5. Find critical value (t- a/2 ) that corresponds to a confidence level of 99% and sample size n=10

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6. Educator wants to find size of the sample to estimate standardized test scores with 90% confidence, being sure that result will be within 2 points of the true population mean µ. Standard deviation is equal to 12. (Don’t forget to round everything up – conservatively) ( You need to find Z-a/2, Error, n).

7. With n=15 and p=0.4 Find

a. P (X to be between 3 and 5)

b. P(X at least 7)

Prove the use of normal approximation, between means not including, need continuity correction.

Subject | Mathematics |

Due By (Pacific Time) | 05/02/2013 02:00 am |

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