Math Problem Solver

Question 11 pts

Which of the following symbols represent the sample size?

Group of answer choices

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Question 21 pts

Which of the following statements describe the relationship between bar charts and Pareto charts?

Group of answer choices

Pareto charts are constructed from tossing a coin several times.

Pareto charts and bar charts are identical.

Pareto charts and bar charts both show the number of observations in each category, but Pareto charts also arrange the bars in descending order.

Pareto charts and bar charts both show the number of observations in each category. However, bar charts use vertical bars, and Pareto charts use horizontal bars.

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Question 31 pts

Researchers published a study in which they considered the incidence among the elderly of various mental health conditions such as dementia, bi-polar disorder, obsessive compulsive disorder, delirium, and Alzheimer's disease. They collected a random sample of 750 adults over 65 and recorded if they suffer from one or more of the conditions under consideration. In the US, 45% of adults over 65 suffer from one or more of the conditions considered in the study.

Is the sample size big enough to meet the requirements for the Central Limit Theorem (CLT) to apply to the sampling distribution of the sample proportion? Explain.

Group of answer choices

No.

and

.

No.

and

.

Yes.

and

.

Yes.

and

.

No.

but

.

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Question 41 pts

If p = 0.349, what is the smallest

that satisfies the requirements that must be met for the Central Limit Theorem (CLT) to apply to the sampling distribution of the sample proportion.

(Round your answer up to the nearest whole number. Example: If you get 101.2 round to 102.)

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Question 51 pts

A political scientist takes a simple random sample of n = 254 registered voters in their county to determine the proportion of registered voters who consider themselves Democrats. Assume the true proportion of registered voters who are Democrats is 34%.

What is the mean of the sampling distribution of sample proportions (

) for this scenario?

(Round your answer to three decimal places.)

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Question 61 pts

A data analyst at an advertising company noted that 45.7% of employees received a phishing email in the previous year. A phishing email replicates an authentic site for the purpose of stealing personal information such as account numbers and passwords. Suppose a random sample of 158 employees will be surveyed on whether they have received phishing emails during the past week to determine if the current trend is different than that of the previous year.

What is the standard deviation of the sampling distribution of sample proportions (

) for this scenario?

(Round your answer to three decimal places.)

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Question 71 pts

A data analyst at an advertising company noted that 44.4% of employees received a phishing email in the previous year. A phishing email replicates an authentic site for the purpose of stealing personal information such as account numbers and passwords. A random sample of 107 employees were surveyed on whether they have received phishing emails during the past week to determine if the current trend is different than that of the previous year. Of the surveyed employees, 82 of them responded that they have received phishing emails during the past week.

What is

for this scenario?

(Round your answer to three decimal places.)

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Question 81 pts

A data analyst at an advertising company noted that 48% of employees received a phishing email in the previous year. A phishing email replicates an authentic site for the purpose of stealing personal information such as account numbers and passwords. A random sample of 76 employees were surveyed on whether they have received phishing emails during the past week to determine if the current trend is different than that of the previous year. Of the surveyed employees, 50% of them responded that they have received phishing emails during the past week.

How many surveyed employees responded that they have received phishing emails during the past week?

(Round your answer to the nearest whole number.)

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Question 91 pts

A data analyst at an advertising company noted that 56.8% of employees received a phishing email in the previous year. A phishing email replicates an authentic site for the purpose of stealing personal information such as account numbers and passwords. A random sample of 148 employees were surveyed on whether they have received phishing emails during the past week to determine if the current trend is different than that of the previous year.

Find the z-score associated with 62 surveyed employees responding that they have received phishing emails during the past week?

(Round your answer to three decimal places.)

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Question 101 pts

A data analyst at an advertising company noted that 43% of employees received a phishing email in the previous year. A phishing email replicates an authentic site for the purpose of stealing personal information such as account numbers and passwords. A random sample of 800 employees were surveyed on whether they have received phishing emails during the past week to determine if the current trend is different than that of the previous year.

Find the probability of more than 45% of the surveyed employees responding that they have received phishing emails during the past week?

(Round your answer to three decimal places.)