BASIC STATS - MODULE 6

 If a p-value is less than 0.05, what should be the conclusion in hypothesis testing?

• Accept the null hypothesis

• Reject the null hypothesis

• Accept the alternative hypothesis

• Increase the sample size

 What is a confidence interval?

• A range of values within which the true population parameter is expected to lie with a certain degree of confidence

• The probability that a sample statistic is true

• The difference between the highest and lowest values in a data set

• A test used to determine if two groups are different

In an APA format report, which of the following correctly reports a significant t-test result?

• t(28) = 2.05, p < .05

• t = 2.05, p < .05

• t(28) = 2.05, p = 0.03

• t = 2.05, p = 0.03

Which of the following is an appropriate use of a paired sample t-test in English teaching research?

• Comparing the mean vocabulary scores of two different classes

• Comparing students' reading comprehension scores before and after using a new teaching method

• Comparing the mean test scores of boys and girls

• Comparing the test scores of students from two different schools

What does an r value indicate in correlation analysis?

• The strength and direction of the relationship between two variables

• The difference between two group means

• The probability of a Type I error

• The likelihood of a Type II error

If the r value is 0.75, what can be said about the relationship between the variables?

• There is a weak positive relationship

• There is a strong positive relationship

• There is a weak negative relationship

• There is a strong negative relationship

What is the correct interpretation of a 95% confidence interval for the mean difference in reading scores between two groups being (2.1, 5.4)?

• We are 95% confident that the true mean difference in reading scores lies between 2.1 and 5.4

• 95% of the time, the mean difference will be exactly 2.1 or 5.4

• There is a 95% probability that the sample mean difference is 2.1 to 5.4

• The mean difference is not statistically significant

 What does it mean if the 95% confidence interval for the difference in means includes zero?

• There is no significant difference between the groups

• The difference between the groups is significant

• The sample size is too large

• The p-value is less than 0.05

Which of the following is true about reporting a p-value in APA format?

• Always report the exact p-value if it is greater than 0.001

• Round the p-value to two decimal places

• Report p-values as p < 0.05 if they are significant

• Report p-values as p > 0.05 if they are not significant

 In an APA formatted results section, which of the following is a correct statement?

• The results showed a significant difference between groups, t(48) = 2.34, p = 0.024

• The results showed a significant difference between groups, t(48) = 2.34, p < 0.05

• The results showed a significant difference between groups, t = 2.34, p = 0.024

• The results showed a significant difference between groups, t = 2.34, p < 0.05