(Solved): WPC300-33872 Assignments: Quiz 3...

The score for this attempt: 20 out of 20

This attempt took 28 minutes.

Question 1

2 / 2 pts

Which of the following is a difference between the t-distribution and the standard normal (z) distribution?

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

Question 2

2 / 2 pts

In order to reject the null hypothesis, the p-value must be less than the

•   Standard deviation
•     Alpha
•    Degrees of freedom
•    Variance

Question 3

2 / 2 pts

Which of the following is a continuous random variable?

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

Question 4

2 / 2 pts

When sample size increases

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

Question 5

2 / 2 pts

Which of the following is a Type-I error?

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

Question 6

2 / 2 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?

•   3.46
•     3.00
•    4.00
•    10.00

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

Question 7

2 / 2 pts

Which of the following proposition describes an existing theory or belief?

•   Standard deviation
•    Proportion
•    Alternative hypothesis
•    Null hypothesis

Question 8

2 / 2 pts

What is the confidence interval when the level of significance is 0.07?

•   0.093
•     0.930
•    7%
•    0.970

Question 9

2 / 2 pts

The central limit theorem states that if the population is normally distributed, then the

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

Question 10

2 / 2 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?

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