Inferential Statistics Week 3 Lab Quiz Answer

Inferential Statistics

Week 3 Lab Quiz Answer

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Inferential Statistics

This course is part of the Statistics with R Specialization

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Week 3 Lab

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Question 1)

There are 1,000 cases in this data set, what do the cases represent?

The days of the births

The births

The fathers of the children

The hospitals where the births took place

Question 2)

How many mothers are we missing weight gain data from?

Question 3)

Make side-by-side boxplots of habit and weight. Which of the following is false about the relationship between habit and weight?

Median birth weight of babies born to non-smoker mothers is slightly higher than that of babies born to smoker mothers,

Both distributions are extremely right skewed.

The IQRs of the distributions are roughly equal.

Range of birth weights of babies born to non-smoker mothers is greater than that of babies born to smoker mothers.

Question 4)

What are the hypotheses for testing if the average weights of babies born to smoking and non-smoking mothers are different?

H₀ : µ_smoking = µ_non-smoking

H_A : µ_smoking > µ_non-smoking

H₀ : µ_smoking = µ_non-smoking

H_A : µ_smoking ≠ µ_non-smoking

H₀ : x_smoking = x_non-smoking

H_A : x_smoking > x_non-smoking

H₀ : µ_smoking ≠ µ_non-smoking

H_A : µ_smoking = µ_non-smoking

Question 5)

Change the type argument to "ci" to construct and record a confidence interval for the difference between the weights of babies born to smoking and non-smoking mothers. Which of the following is the best interpretation of the interval?

We are 95% confident that babies born to nonsmoker mothers are on average 0.05 to 0.58 pounds lighter at birth than babies born to smoker mothers.

We are 95% confident that the difference in average weights of babies whose moms are smokers and nonsmokers is between 0.05 to 0.58 pounds.

We are 95% confident that the difference in average weights of babies in this sample whose moms are smokers and nonsmokers is between 0.05 to 0.58 pounds.

We are 95% confident that babies born to nonsmoker mothers are on average 0.05 to 0.58 pounds heavier at birth than babies born to smoker mothers.

Question 6)

Calculate a 99% confidence interval for the average length of pregnancies (weeks). Note that since you're doing inference on a single population parameter, there is no explanatory variable, so you can omit the 'X' variable from the function. Which of the following is correct interval?