he test of H0: = 19 against Ha: ≠ 19 based on an SRS of 15 observations from a Normal population produces the statistic of t = –1.75.
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If the test of H0: = 19 against Ha: ≠ 19 based on an SRS of 15 observations from a Normal population
produces the statistic of t = –1.75. The P-value is
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- In a test of H0: µ=150 against HA: µ<150, a sample of size 250 produces Z = -0.65 for the value of the test statistic. Thus the p-value is approximately equal toYou are testing against based on an SRS of 20 observations from a Normal population. The t statistic is t= -2.25. Using Table B, the P-value falls between and .A population with a mean of μ = 8 has SX = 40.How many scores are in the population?
- A researcher conducted a Pearson's r test to examine the relationship between study hours and exam scores for a sample of 50 students. The resulting Pearson's r value was 0.6. Can the researcher conclude that there is a strong positive relationship between study hours and exam scores in the population?If the df value for a two tailed test with alpha =0.05 were to increase from df=5 to df=22,what would happen to the critical values for t?In a test of H0:p=0.4 against Ha:p≠0.4, a sample of size 100 produces z=1.28 for the value of the test statistic. Thus the p-value of the test is approximately equal to?
- In a population with σ = 5, a score of X = 46 corresponds to a z-score of z = +0.40. What is the population mean?A researcher interested in exercise endurance in older adults with coronary heart disease measured the endurance of 450 older adults during an exercise routine on a scale of 0-10. He obtained a mean (SD) rating of 6.2 (3.4). Compute the 85% C. I: _____________.In a test of H0:μ = 100 against H1:μ>100, a sample of size 80 producers z= 0.8 for the value of the test statistic. The P-value of the test is equal to?
- An ANOVA produces an F-ratio with df = 1, 34. Could the data have been analyzed with a t test? What would the degrees of freedom be for a t statistic?A random sample of exam scores has a sample mean of x¯=85 and sample standard deviation of s=3. Use the Empirical Rule to estimate the percentage of scores that are less than 76.Assuming all other factors are held constant, if the df value for a two-tailed t-test with a = .05 were increased from df =6 to df = 20, what would happen to the critical values for t?