Quiz 4: Inferential

Alpha

In order to reject the null hypothesis, the p-value must be less than the Standard deviation Degrees of freedom Variance Alpha

2.00

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? 3.00 10.00 3.46 2.00 (sigma/sqrt(n) = 10/sqrt(25) = 2)

distribution of the sample mean will still be normal when the sample size is large

The central limit theorem states that even if the population is not normally distributed, the Sampling distribution of the mean will vary from the sample to sample Mean of the population can be calculated without using samples Standard error of the mean will not vary from the population mean distribution of the sample mean will still be normal when the sample size is large

0.930

What is the confidence level when the level of significance is 0.07? 0.930 0.940 7% 0.093

Confidence interval decreases

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

The null hypothesis is actually true, but the hypothesis test incorrectly rejects it.

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 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 false, and the test correctly rejects it.

The research hypothesis is actually true, and the test incorrectly fails to rejects null hypothesis

Which of the following is a Type-II error? The research hypothesis is actually true, and the test incorrectly fails to rejects null hypothesis The null hypothesis is actually true, and the hypothesis test correctly fails to reject it. The research hypothesis is actually true, but the test correctly rejects the null hypothesis. The null hypothesis is actually true, but the hypothesis test incorrectly rejects it.

The time to complete a specific task

Which of the following is a continuous random variable? The outcomes of rolling two dice The number bounced check from a bank The number of new hires in a year The time to complete a specific task

The t-distribution has a larger variance than the standard normal distribution.

Which of the following is a difference between the t-distribution and the standard normal (z) distribution? 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. 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 outcomes of rolling two dice

Which of the following is not a continuous random variable? The possible amount of rain on a given day The pollution level (measured in air quality index) in the air around us The time to complete a specific task The outcomes of rolling two dice

Null hypothesis

Which of the following proposition describes an existing theory or belief? Proportion Null hypothesis Standard deviation Alternative hypothesis

Anonymously data collection by hiding ASU brand in the survey question.

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?

The mean response from at least one treatment group is different from that of the others

You arrived at a significant test statistic (p-value < 0.05) when comparing responses from three treatment groups in a one-way ANOVA. How would you interpret the alternative hypothesis for this test? The mean responses from all three treatment groups are the same None of the other answers is true The mean responses from all three treatment groups are different The mean response from at least one treatment group is different from that of the others