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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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