1.
A t-test is a significance test that assesses
Correct Answer
A. The means of two independent groups
Explanation
A t-test is a statistical test used to compare the means of two independent groups. It is used to determine if there is a significant difference between the means of the two groups, indicating that there is a real effect or relationship. The t-test calculates a t-value, which is then compared to a critical value to determine if the difference between the means is statistically significant. Therefore, the given answer correctly identifies that a t-test is used to assess the means of two independent groups.
2.
To use a t-test, the dependent variable must have
Correct Answer
C. Interval or ratio data
Explanation
A t-test is a statistical test used to determine if there is a significant difference between the means of two groups. It is appropriate to use a t-test when the dependent variable has interval or ratio data. Interval data is numerical data where the difference between any two values is meaningful, and ratio data is similar but includes a true zero point. These types of data allow for meaningful calculations of means and differences between groups, which is necessary for conducting a t-test.
3.
Statistical significance or the probability of finding statistical significance is also known as
Correct Answer
B. p-value
Explanation
The correct answer is p-value. Statistical significance or the probability of finding statistical significance is commonly referred to as the p-value. The p-value is a measure of the strength of evidence against the null hypothesis and indicates the likelihood of obtaining the observed results by chance alone. It is used in hypothesis testing to determine whether the results of a study are statistically significant or not.
4.
T-tests and other significance tests are frequently criticized. Over-representation of statistical significance in research may result in:
Correct Answer
A. Publication bias
Explanation
The over-representation of statistical significance in research can lead to publication bias. This occurs when studies with statistically significant results are more likely to be published, while studies with non-significant results are often overlooked or not published. This bias can distort the overall body of research, leading to an inaccurate understanding of the true effects of a particular phenomenon.
5.
The three types of t-tests are
Correct Answer(s)
A. One-sample t-tests
C. Independent sample t-tests
D. Paired samples t-tests;
Explanation
The correct answer is a list of three types of t-tests: one-sample t-tests, independent sample t-tests, and paired samples t-tests. These three types of t-tests are commonly used in statistical analysis to compare means between different groups or conditions. One-sample t-tests are used when comparing a sample mean to a known population mean. Independent sample t-tests are used when comparing the means of two independent groups. Paired samples t-tests are used when comparing the means of two related or paired groups. Variable t-tests mentioned in the question are not a recognized type of t-test.
6.
Into how many types can we classify measures of dispersion?
Correct Answer
C. 5
Explanation
Measures of dispersion can be classified into five types. These types include range, quartiles, variance, standard deviation, and coefficient of variation. Range measures the spread between the highest and lowest values in a dataset. Quartiles divide the data into four equal parts. Variance measures how spread out the data is from the mean. Standard deviation is the square root of variance and provides a more intuitive understanding of the spread. Lastly, the coefficient of variation measures the relative variability of a dataset by comparing the standard deviation to the mean.
7.
This is the mode value for the data set:
0,3,4,5,7,7,7,7,7,8,10,10
Correct Answer
A. 7
Explanation
The mode value is the value that appears most frequently in a data set. In this case, the number 7 appears 5 times, which is more than any other number in the set. Therefore, the mode value for this data set is 7.
8.
Which of these is a type of T-test?
Correct Answer
D. All of these
Explanation
All of these options are types of T-tests. A T-test is a statistical test used to determine if there is a significant difference between the means of two groups. The one sample t-test is used to compare the mean of a single sample to a known population mean. The independent two-sample t-test compares the means of two independent groups. The paired sample t-test compares the means of two related groups, such as before and after measurements. Therefore, all three options mentioned are valid types of T-tests.
9.
The T-test is not a reliable test.
Correct Answer
B. False
Explanation
The given statement suggests that the T-test is not a reliable test. However, the correct answer is False, which means that the T-test is indeed a reliable test. This implies that the T-test can be trusted and is a valid statistical method for analyzing data and making inferences about population parameters.
10.
The T-test tells you about the significant difference between the two groups.
Correct Answer
A. True
Explanation
The T-test is a statistical test that is used to determine if there is a significant difference between the means of two groups. Therefore, the statement that the T-test tells you about the significant difference between the two groups is true. The T-test calculates a T-value and compares it to a critical value to determine if the difference between the groups is statistically significant. If the calculated T-value is greater than the critical value, it indicates that there is a significant difference between the two groups.