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(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


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