Name: 1. (3 Pts) When performing a test of hypothesis, the null hypothesis only

Question

Name: 1. (3 Pts) When performing a test of hypothesis, the null hypothesis only contains the equal sign. Is 2 3 Pts) When testing a hypothesis about a population mean, with the population known, if a this statement True or False? (Circle your answer) random sample size greater than 30 is taken, which of the following is correct? a) The sample can be assumed to be from a normal population b) The sampling distribution of the sample means can be assumed to be a normal distribution c) Both a and b. (3 Pts) The effectiveness of a headache medicine is tested by measuring the intensity of a headache in patients before and after drug treatment. Which of the following is the best method to use to test the effectiveness of the headache medicine? 3. a) Independent samples b) Dependent or paired samples (3 Pts) When testing a claim that two populations have different means, a P-value of 0.004 is obtained. Using a 1% significance level, is Ho rejected or not rejected? (3 pts) Using the result in the previous question, select which of the following is correct: a) The data provides sufficient evidence to support the claim b) The data does not provide sufficient evidence to support the claim (3 Pts) When testing a hypothesis of a population proportion, what assumption is met when the umber of successes, x and the number of failures, (n - x) are both greater than 5: Choose the orrect statement. a) The sample came from a normal population b) The sampling distribution of the sample proportion is approximately a normal distribution Pts) An article in a newspaper claims that the proportion of traffic accidents involving road higher this year than last year's proportion of 15%. Determine the null and alternate hypoth u would use to test this claim. Is this a right tail, left tail, or two-tailed test? Ho: Ha.: ts) Determine the null and alternate hypothesis you would use to test the claim that the ing distance of four-cylinder cars is greater than the mean braking distance of six-cylin Ho: Ha:

Explanation / Answer

Ans:

1)False

Null hypothesis can have sign = or >= or <=

2)Option c( both a and b are correct.)

sample can be assumed to be from a normal distribution.

Sampling distribution of sample means can be assumed to be a normal distribution.

3)Option b is correct.

Dependent or paired samples(as same subject is measured at different times)

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