Question

True/False

1. Suppose we know for a fact that on a certain memory test, recognition is not any better than recall. However, the P-value for the data from your sample is 0.04, so you were able to reject the null hypothesis at α = 5%. A Type I Error was committed.

2. Consider the following question: Do women make more visits to their primary care physician in a year than men? If independent samples are taken from both females and males, then a Two Independent Samples t-test can be applied.

3. The Levene Test is used in conjunction with the Paired Samples t-test.

4. One of the most feared predators in the ocean is the great white shark. It is known that the white shark grows to a mean length of 20 feet; However, one marine biologist believes that great white sharks off the Bermuda coast grow much longer. The null and alternate hypotheses are ??:?=20 ??:?<20

5. Jen thinks a certain potato chip maker is putting fewer chips in their regular bags of chips. From a random sample of 21 bags of potato chips she calculated a P value of 0.007 for the sample. At the 1% level of significance, Jen’s evidence is not strong enough to reject the null hypothesis.

6. The one-sample t-test is used to compare a sample mean to a population mean when the population standard deviation is known.

7. Some researchers have suggested that blood pressure may tend to be higher on average when measured on a subject's right arm than on their left arm. A doctor decided to investigate this conjecture by taking readings of the systolic blood pressure on both arms of a random selection of twelve patients at his practice. A paired samples t-test can be applied.

8. If the sample size is n = 21 and the population standard deviation is unknown, the critical value t needed to construct a 90% confidence level for μ is t = 1.721.

9. A biotechnology company wants to compare how effective two of its drugs are for treating diabetes. If the biotech company does not reject the null hypothesis that the two drugs are equally effective when in fact the drugs are not equally effective, a type II error occurs.

Answer 1

1)

type I error : TRUE

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2)

two different samples are taken : t test : TRUE

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3. The Levene Test is used in conjunction with the Paired Samples t-test.

FALSE

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4)

FALSE (Ha >20)this will be hypothesis

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5)

FALSE

p value<0.01 , so there will be evidence

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6)

The one-sample t-test is used to compare a sample mean to a population mean when the population standard deviation is known.

FALSE (T TEST IS USED WHEN POPULATIONSTD DEV IS UNKNOWN)

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7)

FALSE (TWO ARMS ARE DIFFERENT)

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8)

TRUE

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9)

TRUE

typeII error occur when non rejection of null hypothesis happens

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