Z-test & T-test Assessment Test

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  • 1/10 Questions

    What is used for comparing the means of two populations if you do not know the populations' standard deviation?

    • J test
    • Q test
    • O test
    • T test
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About This Quiz

Z-test and T-test are two different tests used for statistical hypothesis testing. Take this assessment test to assess your knowledge of these tests.

Z-test & T-test Assessment Test - Quiz

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  • 2. 
    When you know the populations' standard deviation, what do you use? - ProProfs

    When you know the populations' standard deviation, what do you use?

    • P test

    • Z test

    • M test

    • S test

    Correct Answer
    A. Z test
    Explanation
    When you know the population's standard deviation, you use the Z test. The Z test is a statistical test that is used to determine whether the mean of a sample is significantly different from a known population mean when the population standard deviation is known. It is based on the standard normal distribution and allows for hypothesis testing and calculating p-values. The Z test is commonly used in research and statistical analysis to make inferences about population means.

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  • 3. 
    When you know the populations' standard deviation, what do you use?  - ProProfs

    When you know the populations' standard deviation, what do you use? 

    • Z test

    • Null test

    • P test

    • M test

    Correct Answer
    A. Z test
    Explanation
    When you know the population's standard deviation, you use a Z test. A Z test is a statistical test that is used to determine whether the means of two populations are significantly different from each other when the population standard deviation is known. It compares the observed data to the expected data under the null hypothesis and calculates a Z score, which is then compared to a critical value to determine the significance of the result.

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  • 4. 
    What is used when we want to know whether the difference between a sample mean and the population mean is large enough to be statistically significant? - ProProfs

    What is used when we want to know whether the difference between a sample mean and the population mean is large enough to be statistically significant?

    • One-Sample z-test

    • F test

    • Line test

    • Litmus test

    Correct Answer
    A. One-Sample z-test
    Explanation
    The One-Sample z-test is used when we want to determine if the difference between a sample mean and the population mean is statistically significant. This test calculates the z-score, which measures how many standard deviations the sample mean is away from the population mean. By comparing the calculated z-score to a critical value, we can determine if the difference is large enough to be statistically significant.

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  • 5. 
    Which calculations are used to test a hypothesis? - ProProfs

    Which calculations are used to test a hypothesis?

    • T test

    • F test

    • Litmus test

    • Theory

    Correct Answer
    A. T test
    Explanation
    A T test is used to test a hypothesis by comparing the means of two groups and determining if there is a significant difference between them. It calculates the t-value, which is then compared to a critical value to determine if the results are statistically significant. The T test is commonly used when the sample size is small and the population standard deviation is unknown. It helps researchers make inferences about the population based on the sample data. The F test, on the other hand, is used to compare the variances of two or more groups. Litmus test and theory are not calculations used to test a hypothesis.

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  • 6. 
    If the mean change score is not significantly different from zero... - ProProfs

    If the mean change score is not significantly different from zero...

    • No significant change occurred

    • Value is wrong

    • Change occurred

    • Value is correct

    Correct Answer
    A. No significant change occurred
    Explanation
    If the mean change score is not significantly different from zero, it means that the observed change is not statistically significant. This suggests that there is no evidence to support the occurrence of a significant change. Therefore, the correct answer is "No significant change occurred".

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  • 7. 
     T test is used when you have... - ProProfs

     T test is used when you have...

    • Lot of value

    • Little value 

    • Limited sample

    • Too much sample

    Correct Answer
    A. Limited sample
    Explanation
    The T test is used when there is a limited sample size. This is because the T test is specifically designed to analyze small sample sizes, where the population standard deviation is unknown. It is a statistical test that compares the means of two groups to determine if there is a significant difference between them. In situations where there is a large sample size, other tests like the Z test or chi-square test may be more appropriate.

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  • 8. 
    Which of these shows how likely a sample result is to occur by random chance?   - ProProfs

    Which of these shows how likely a sample result is to occur by random chance?  

    • P value

    • Null test

    • K test

    • M test

    Correct Answer
    A. P value
    Explanation
    The P value is a statistical measure that indicates the likelihood of obtaining a sample result by random chance. It is used in hypothesis testing to determine the significance of the results. A smaller P value suggests that the sample result is less likely to occur by random chance, indicating stronger evidence against the null hypothesis. Therefore, the P value is the correct answer as it directly relates to the likelihood of a sample result occurring by random chance.

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  • 9. 
    If your T-Score is above 50, then it is...  - ProProfs

    If your T-Score is above 50, then it is... 

    • Average

    • Below average

    • Above average

    • Exactly average

    Correct Answer
    A. Above average
    Explanation
    If your T-Score is above 50, it means that your score is higher than the average. Therefore, the correct answer is "Above average".

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  • 10. 
    Statistical calculations that can be used to compare population means to a sample is... - ProProfs

    Statistical calculations that can be used to compare population means to a sample is...

    • O test

    • Z test

    • T test

    • Sample test

    Correct Answer
    A. Z test
    Explanation
    The Z test is a statistical calculation that can be used to compare population means to a sample. It is commonly used when the sample size is large and the population standard deviation is known. The Z test calculates the Z score, which measures how many standard deviations the sample mean is away from the population mean. By comparing the Z score to a critical value, we can determine if the sample mean is significantly different from the population mean.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 10, 2018
    Quiz Created by
    Cripstwick
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