Some quizz questions (1)

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Laurentian University *

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Statistics

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Feb 20, 2024

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Some quizz questions ● For a population, the largest distance between a score and the mean is 11 points. the smallest distance between a score and the mean is 4 points. therefore the standard deviation will be less than 4 or between 4 and 11 or greater than 4~? ● a sample of n=8 scores has. ss=50. If these same scores were a population what would be the ss value for the population? ● John drives to work each morning and the trip takes an average of mean equal 38 minutes. the distribution of driving times is approximately normal with a standard deviation of 5 mins. for a randomly selected morning what is the probability that johns s drive to work will take less than 35 minutes ● For a sample with M=50 and s=12, what is the X value corresponding to z=-0.25 ● If the sample statistic is equal to the corresponding population parameter, then the statistic is unbiased, true or false? ● A population has a mean of 50, what value of the standard deviation would make X=55 a central representative score in the population? ● Which of the following z score values represents the location farthest from the mean? +0.50 or +1.00 or -1.00 or -2.00? ● For an exam with a mean of 74 and a standard deviation of 8. Mary has a score of 80, Bob has a score that corresponds to z=+1.5. and Sue's score is located above the mean by 10 points. If the students are placed in order from the smallest score to the largest score, what is the correct order? ● The sum of the squared deviation scores is ss=20 for a sample of n=5 scores. what is the variance for this sample ● A normal distribution has a mean of 20 and standard deviation of 4. what is the probability of randomly selecting a score greater than 25 from this distribution ● What is the range for the following scores? 5,7,9, 15?

Some quizz questions ● On an exam with a mean of 70 you have a score of 75. Which of the following values for the standard deviation would give a highest position with the class?1 or 5 or 10 or cannot determine? ● ● under what circumstances is a score that is 15 points above the mean an extreme score relatively far from the mean ● Normal distribution has a mean of 70 with a standard deviation of 12. If a score is randomly selected what is the probability it will be greater than 58. ● can use a z-table or a calculator to look up the proportions associated with these z-scores. These proportions will give you the percentage of the population falling into each category. ● A HYPOthesis test involves a comparison of which two elements ● which combination of factors will produce the largest value for the standard error ● the critical boundaries for a hypothesis test are z=+1.96 if the z score for the sample is -1.90 what is the correct statistical decision ● The Pearson and the spearman correlations are both computed for the same set of data. if the spearman correlation is rs=1 what can you conclude about the pearson correlation ● What is the sample variance of n=9 scores with ss=72? what is the sample variance of n=12 scores with ss=132 ● Which of the following is an accurate definition of type I error ? rejecting a false null hypothesis or rejecting a true null hypothesis or failing to reject a false null hypothesis or failing to reject a true null hypothesis? ● if all the possible random samples with n=36 scores are selected from a normal population with mean=80 and standard deviation = 18 and the mean is

Some quizz questions ● which of the following best describes the pearson correlation for these data X (2,5,3,4) F (5,1,4,2) ● What is the expected value of M ● YOU complete a hypothesis test using alpha =0.05 and based on the evidence from the sample your decision is to reject the null hypothesis. If the treatment actually does have an effect, which of the following is true? you have made a type I error or you have made a type II error OR you might made a type I error or you have made the correct decision ● Which of the following will increase the power of a statistical test? change alpha from .05 to .01 or change from one tailed test to two tailed test or change the sample size from n=25. to n=100 or none of the options? ● which of the following pearson correlations shows the greatest strength or consistency of relationship -0.90 or 0.74 or 0.85 or -0.33 ● A hypothesis test produces a t statistic of z=2.20. if the researcher is using a two tailed test with alpha =0.05 how large does the sample have to be in order to reject the null hypothesis ● tailed test with alpha =0.05 how large does the sample have to be in order to reject the null hypothesis at least n=11 or at least n=12 or at least n=13 or it doesn't matter ● A sample of n=100 scores is selected from a population with mean 80 and standard deviation 20. on average of how much error is expected between the sample mean and the population mean? 0.2 or 0.8 or 2 or 4 ● under what circumstances can a very small treatment effect still be significant? ● Which of the following accurately describes the critical region? outcomes with very low probability if the null hypothesis is true or "Outcomes with high probability if the null hypothesis is true.

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