Question

1. A manufacturer is interested in the output voltage of a power supply used is a PC. Output voltage is assumed to be normally distributed with standard deviation 0.25 Volts, and the manufacturer wishes to test H₀: μ = 5 Volts against H_a: μ≠ 5 Volts, using n = 8 units at 5% significance level. If the sample mean is 5.10, then the corresponding p-value is

   		0.295
   		0.258
   		0.05
   		1.13

2. ) In testing the hypotheses H₀: μ = 200 vs. H_a: μ &λτ;200, the sample mean is found to be 120. The null hypothesis:

   		should be rejected
   		should not be rejected
   		should be rejected only if n > 30
   		none of the above answers is correct

1. 3 ) If we reject H₀ at the 5% level, then

   		we must also reject at the 1% level.
   		we have a 5% chance of making a Type II error.
   		then the hypothesized value would not be in a 95% confidence interval calculated from the same data.
   		then hypothesized value would be in a 95% confidence interval calculated from the same data.

   
   4 ) A new soft drink is being market tested.  A sample of 400 individuals participated in the taste test and 80 indicated they like the taste. We need to test to determine if less than 22% of the population will like the new soft drink, the the p-value is

2. 		0.1671
   		0.8329
   		0.3342
   		0

   
   5 ) A random sample of 16 statistics examinations from a large population was taken.  The average score in the sample was 78.6 with a variance of 64.  We are interested in determining whether the average grade of the population is significantly more than 75.  Assume the distribution of the population of grades is normal. The test statistic is

3. 		0.45
   		1.80
   		3.6
   		8

Answer 1

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