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# (Solved): WPC 300 Quiz 8 Score for this attempt: 15 out of 15...

Score for this attempt: 15 out of 15
Submitted Mar 16 at 11:55pm
This attempt took 11 minutes.

Question 1
1.5 / 1.5 pts
Which of the following proposition describes an existing theory or belief?

• Proportion
• Alternative hypothesis
• Standard deviation
• Null hypothesis

Question 2
1.5 / 1.5 pts
When sample size increases

• Confidence interval remains the same
• Standard deviation of the sample mean increases
• Confidence interval increases
• Confidence interval decreases

Question 3
1.5 / 1.5 pts
Which of the following is a Type-I error?

• The null hypothesis is actually false, but the test incorrectly fails to reject it.
• The null hypothesis is actually true, and the hypothesis test correctly fails to reject it.
• The null hypothesis is actually true, but the hypothesis test incorrectly rejects it.
• The null hypothesis is actually false, and the test correctly rejects it.

Question 4
1.5 / 1.5 pts
Which of the following is a difference between the t-distribution and the standard normal (z) distribution?

• The standard normal distributions' confidence levels are wider than those of the t-distribution
• The standard normal distribution is dependent on parameters like degree of freedom, while t-distribution is not.
• The t-distribution has a larger variance than the standard normal distribution
• The t-distribution cannot be calculated without a known standard deviation, while the standard normal distribution can be.

Question 5
1.5 / 1.5 pts
You are collecting data via an online survey to improve education standard at ASU. Which of the following methods will not result in data collection bias?

• Those with an interest in your mission are the ones to participate in the survey
• Some individuals are less likely to participate because they have strong opinions against ASU education standard.
• Polls are completed only by visitors to the site
• Anonymously data collection by hiding ASU brand in the survey question.

Question 6
1.5 / 1.5 pts
The central limit theorem states that if the population is normally distributed, then the

• Mean of the population can be calculated without using samples
• Sampling distribution of the mean will also be normal for any sample size
• Standard error of the mean will not vary from the population mean
• Sampling distribution of the mean will vary from the sample to sample

Question 7
1.5 / 1.5 pts
In order to reject the null hypothesis, the p-value must be less than the

• Degrees of freedom
• Standard deviation
• Variance
• Alpha

Question 8
1.5 / 1.5 pts
The WPC Sports Company has noted that the size of individual "customer order" is normally distributed with a mean of \$100 and standard deviation of \$12. If a soccer team of 16 players were to make the next batch of orders, what would be the standard error of the mean?

• 10.00
• 4.00
• 3.00
• 3.46

sigma/sqrt(n) = 12/sqrt(16) = 12/4 = 3

Question 9
1.5 / 1.5 pts
Which of the following is a continuous random variable?

• The number of new hires in a year
• The outcomes of rolling two dice
• The time to complete a specific task
• The number bounced check from a bank

Question 10
1.5 / 1.5 pts
What is the confidence interval when the level of significance is 0.07?

• 0.930
• 0.093
• 0.970
• 7%

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