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Week 8 Worksheet.

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User Generated

Subject

Statistics

School

Dixie State University

Course

EHS 2550

Type

Homework

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xbune844

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EHS 2550

Homework 5

Part I. Worksheet (3 points)

Upload your Week 8 Worksheet.

Part II. Homework questions. (28 points)

1. What is the point of a hypothesis test? (1 point)

Hypothesis testing is used to assess two mutually exclusive statements about a population to

which is best supported by using sample data.

2. An article in Science News reported on a study to compare treatments for reducing

cocaine use. Part of the results are:

Short-term psychotherapy that offers cocaine abusers practical strategies for

maintaining abstinence sparks a marked drop in their overall cocaine use… In

contrast, brief treatment with desipramine – a drug thought by some researchers

to reduce cocaine cravings – generates much weaker drops in cocaine use.

a) The researchers were obviously interested in comparing the rates of cocaine use

following treatment with the two methods. State the null and alternative hypotheses for

this situation. (1 points)

: Short-term psychotherapy and brief treatment with desipramine have the same effect in

controlling cocaine use.

: One of the treatment method is more effective than the other.

b) Explain what the two types of error could be for this situation and what their

consequences would be. (1 points)

Type I error and Type II error could be for this situation. Type I error occurs if the null hypothesis

is rejected when it is actually true. This will cause to draw the conclusion that one of the treatment

method is more effective than the other, when the truth is that they have the same effect in

controlling cocaine use. Type II error occurs if the null hypothesis is accepted when it is actually

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false. In this case, it will be concluded that short-term psychotherapy and brief treatment with

desipramine have the same effect in controlling cocaine use when in fact one of the treatment

method is more effective than the other

c) Although no p-value is given, the researchers presumably concluded that the

psychotherapy treatment was superior to the drug treatment. Which type of error could

they have made? Why? (1 points)

The researchers could have made Type I error because they rejected the null hypothesis when

in fact it is true, that is short-term psychotherapy and brief treatment with desipramine have the

same effect in controlling cocaine use.

3. State the null and alternative hypotheses for each of the following potential research

questions:

a) Does working 5 hours a day or more at a computer contribute to deteriorating

eyesight? (1 points)

: Working 5 hours a day or more at a computer does not contribute to deteriorating eyesight

: Working 5 hours a day or more at a computer contribute to deteriorating eyesight

b) Does placing babies in an incubator during infancy lead to claustrophobia in adult life?

(1 points)

: Placing babies in an incubator during infancy does not lead to claustrophobia in adult life

: Placing babies in an incubator during infancy leads to claustrophobia in adult life

c) Does placing plants in an office lead to fewer sick days? (1 points)

: Placing plants in an office does not lead to fewer sick days

: Placing plants in an office leads to fewer sick days

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EHS 2550 Homework 5 Part I. Worksheet (3 points) Upload your Week 8 Worksheet. Part II. Homework questions. (28 points) 1. What is the point of a hypothesis test? (1 point) Hypothesis testing is used to assess two mutually exclusive statements about a population to which is best supported by using sample data. 2. An article in Science News reported on a study to compare treatments for reducing cocaine use. Part of the results are: Short-term psychotherapy that offers cocaine abusers practical strategies for maintaining abstinence sparks a marked drop in their overall cocaine use… In contrast, brief treatment with desipramine – a drug thought by some researchers to reduce cocaine cravings – generates much weaker drops in cocaine use. a) The researchers were obviously interested in comparing the rates of cocaine use following treatment with the two methods. State the null and alternative hypotheses for this situation. (1 points) H0: Short-term psychotherapy and brief treatment with desipramine have the same effect in controlling cocaine use. HA: One of the treatment method is more effective than the other. b) Explain what the two types of error could be for this situation and what their consequences would be. (1 points) Type I error and Type II error could be for this situation. Type I error occurs if the null hypothesis is rejected when it is actually true. This will cause to draw the conclusion that one of the treatment method is more effective than the other, wh ...
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