# (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%