STT EXAM 2 QUESTIONS AND ANSWERS
ALL CORRECT
A pharmaceutical researcher is investigating the side effects of a new cold medicine.
They decide to use a reaction time test that is known to have results that are normally
distributed with a mean score of 200.
They recruit a random sample of 15 healthy adults who are given a dose of the cold
medication. One hour later, the subjects each complete the reaction time test. The
sample mean reaction time is calculated to be 𝑥̅ = 215, with a standard deviation 𝑠 =
20.
The resulting test produced a test statistic of 𝑡 = 2.9047, with a p-value of 0.0058,
=
and 𝑑
= 0.75. Based on these results, there is _____________ evidence against the
null model - Answer- Very strong
A pharmaceutical researcher is
investigating the side effects of a new cold medicine. They decide to use a reaction time
test that is known to have results that are normally distributed with a mean score of 200.
They recruit a random sample of 15 healthy adults who are given a dose of the cold
medication. One hour later, the subjects each complete the reaction time test. The
sample mean reaction time is calculated to be 𝑥̅ = 215, with a standard deviation 𝑠 =
20.
Our sample results indicate the estimated effect size is __________________. -
Answer- Moderate-to-large
Age: subject's age (in years)
Calories: number of calories consumed per day
Cholesterol: cholesterol consumed (mg per day)
BetaDiet: dietary beta-carotene consumed (mcg per day)
RetinolDiet: dietary retinol consumed (mcg per day)
A researcher is interested in looking at the amount of cholesterol an individual
consumes. Suppose for individuals having the elective surgical procedure in this study,
dietary guidelines recommend limiting to cholesterol intake to 250 mg per day.
What set of hypotheses should be used for testing the following question: Is there
evidence that all patients who have this elective surgical procedure, as represented
by the sample in this study, have a mean cholesterol intake greater than 250 mg per
day? - Answer- 𝑯𝟎: 𝝁 = 𝟐𝟓𝟎 vs 𝑯𝒂: 𝝁 > 𝟐𝟓𝟎
ALL CORRECT
A pharmaceutical researcher is investigating the side effects of a new cold medicine.
They decide to use a reaction time test that is known to have results that are normally
distributed with a mean score of 200.
They recruit a random sample of 15 healthy adults who are given a dose of the cold
medication. One hour later, the subjects each complete the reaction time test. The
sample mean reaction time is calculated to be 𝑥̅ = 215, with a standard deviation 𝑠 =
20.
The resulting test produced a test statistic of 𝑡 = 2.9047, with a p-value of 0.0058,
=
and 𝑑
= 0.75. Based on these results, there is _____________ evidence against the
null model - Answer- Very strong
A pharmaceutical researcher is
investigating the side effects of a new cold medicine. They decide to use a reaction time
test that is known to have results that are normally distributed with a mean score of 200.
They recruit a random sample of 15 healthy adults who are given a dose of the cold
medication. One hour later, the subjects each complete the reaction time test. The
sample mean reaction time is calculated to be 𝑥̅ = 215, with a standard deviation 𝑠 =
20.
Our sample results indicate the estimated effect size is __________________. -
Answer- Moderate-to-large
Age: subject's age (in years)
Calories: number of calories consumed per day
Cholesterol: cholesterol consumed (mg per day)
BetaDiet: dietary beta-carotene consumed (mcg per day)
RetinolDiet: dietary retinol consumed (mcg per day)
A researcher is interested in looking at the amount of cholesterol an individual
consumes. Suppose for individuals having the elective surgical procedure in this study,
dietary guidelines recommend limiting to cholesterol intake to 250 mg per day.
What set of hypotheses should be used for testing the following question: Is there
evidence that all patients who have this elective surgical procedure, as represented
by the sample in this study, have a mean cholesterol intake greater than 250 mg per
day? - Answer- 𝑯𝟎: 𝝁 = 𝟐𝟓𝟎 vs 𝑯𝒂: 𝝁 > 𝟐𝟓𝟎
