# Statistic Homework: will send photos for a better view of the questions: 7.1, 7.2, 7.3

Can you help me understand this Statistics question?

A magazine provided results from a poll of 10001000

10001000

respondents,

1212%

chose chocolate pie, and the margin of error was given as

plus or minus±33

percentage points. Describe what is meant by the statement that “the margin of error was given as

plus or minus±33

percentage points.”

The statement indicates that the study is 100%minus33%equals=9797%

confident that the true population percentage of people that prefer chocolate pie is

1212%.

The statement indicates that the study is only 33%

confident that the true population percentage of people that prefer chocolate pie is exactly

1212%.

The statement indicates that the interval 1212%plus or minus±33%

is likely to contain the true population percentage of people that prefer chocolate pie.

The statement indicates that the true population percentage of people that prefer chocolate pie is in the interval 1212%plus or minus±33%.

Find the critical value z Subscript alpha divided by 2zα/2

that corresponds to the given confidence level.

9999%

z Subscript alpha divided by 2zα/2equals=nothing

(Round to two decimal places as needed.)

Find the critical value z Subscript alpha divided by 2zα/2

that corresponds to the confidence level

8585%.

z Subscript alpha divided by 2zα/2equals=nothing

(Round to two decimal places as needed.)

Use the sample data and confidence level given below to complete parts (a) through (d).

A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n equals 983n=983

and

x equals 518x=518

who said “yes.” Use a

95 %95%

confidence level.

Click the icon to view a table of z scores.

a) Find the best point estimate of the population proportion p.

nothing

(Round to three decimal places as n

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 360360

babies were born, and

306306

of them were girls. Use the sample data to construct a

9999%

confidence interval estimate of the percentage of girls born. Based on the result, does the method appear to be effective?

nothingless than<

pless than<nothing

(Round to three decimal places as needed.)

Which concept below is NOT a main idea of estimating a population proportion?

Using a sample statistic to estimate the population proportion is utilizing descriptive statistics.

Knowing the sample size necessary to estimate a population proportion is important.

We can use a sample proportion to construct a confidence interval to estimate the true value of a population proportion.

The sample proportion is the best point estimate of the population proportion.

Which of the following groups has terms that can be used interchangeably with the others?

Critical Value, Probability, and Proportion

Critical Value, Percentage, and Proportion

Percentage, Probability, and Proportion

Critical Value, Percentage, and Probability

Fill in the blank.

A _______ is a single value used to approximate a population parameter.

A

continuity correction

point estimate

sample size

confidence interval

is a single value used to approximate a population parameter.

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