Inferential Statistics Week 4 Lab Quiz Answer

Inferential Statistics

Week 4 Lab Quiz Answer

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Inferential Statistics

This course is part of the Statistics with R Specialization

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Week 4 Lab

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Question 1)

How many people were interviewed for this survey?

A poll conducted by WIN-Gallup International surveyed 51,000 people from 57 countries

A poll conducted by WIN-Gallup International surveyed 51,927 people from 57 countries

A poll conducted by WIN-Gallup International surveyed 51,917 people from 57 countries

Apoll conducted by WIN-Gallup International surveyed 52,000 people from 57 countries

Question 2)

Which of the following methods were used to gather information?

Face to face

Telephone

Internet

All of the above

Question 3)

In the first paragraph, several key findings are reported. These percentages appear to be sample statistics.

True

False

Question 4)

The title of the report is "Global Index of Religiosity and Atheism". To generalize the report's findings to the global human population, We must assume that the sample was a random sample from the entire population in order to be able to generalize the results to the global human population. This does seem to be a reasonable assumption.

True

False

Question 5)

What does each row of Table 6 correspond to?

Religions

Countries

Individual Persons

Question 6)

What does each row of atheism correspond to?

Countries

Religions

Individual Persons

Question 7)

Using the command below, create a new dataframe called us12 that contains only the rows in atheism associated with respondents to the 2012 survey from the United States. Next, calculate the proportion of atheist responses. [TRUE / FALSE] This percentage agrees with the percentage in Table 6.

True

False

Question 8)

Based on the R output, what is the margin of error for the estimate of the proportion of the proportion of atheists in US in 2012?

The margin of error for the estimate of the proportion of atheists in the US in 2012 is 0.05.

The margin of error for the estimate of the proportion of atheists in the US in 2012 is 0.0135.

The nhergin of error for the estimate of the proportion of atheists in the US in 2012 is 0.025.

Question 9)

Which of the following is false about the relationship between p and ME.

The ME reaches a minimum at p = 1

The ME reaches a minimum at p = 0

The most conservative estimate for calculating a confidence interval occurs when p is set to 1

The ME is maximized when p = 0.5

Question 10)

There is convincing evidence that Spain has seen a change in its atheism index between 2005 and 2012.

True

False

Question 11)

There is convincing evidence that the United States has seen a change in its atheism index between 2005 and 2012

True

False

Question 12)

If in fact there has been no change in the atheism index in the countries listed in Table 4, in how many of those countries would you expect to detect a change (at a significance level of 0.05) simply by chance? Hint: Type 1 error.

Question 13)

Suppose you're hired by the local government to estimate the proportion of residents that attend a religious service on a weekly basis. According to the guidelines, the estimate must have a margin of error no greater than 1% with 95% confidence. You have no idea what to expect for p. How many people would you have to sample to ensure that you are within the guidelines?Hint: Refer to your plot of the relationship between p and margin of error. Do not use the data set to answer this question.