(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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