Question

1. Suppose you are using a = 0.05 to test the claim that > 13 using a P-value. You are given the sample statistics n = 35, x = 13.3, and s-1.2. Find the P-value. The p-value is 2. In the test above, what is the standardized test statistic? The standardized test statistic: t = or z = (circle one and fill in) 3. Given He: p 2 80% and H. p < 80%, determine whether the hypothesis test is left-tailed tailed, or two-tailed. A) left-tailed B) right-tailed C) two-tailed D) None of these 10.2.C 4. A random sample of 39 students has a test score with X 81.5 and confidence interval for the population mean test score, H. 90% Confidence interval: 5. Given the same sample statistics, which level of confidence will produce the narrowest confidence interval? A) 95% B) 90% C) 85% D) 75% 6. The results of a recent study show that the proportion of people in the United States who use seatbelts when riding in a car or truck is 94%. A researcher wants to know if this is different from the current percentage. Write the null and alternative hypotheses that could be used to test this claim. You must show the parameters in your hypotheses. H : H

Answer 1

- D Giren - The test claim that el 713 Hotel = 13 vs Hill> 13 n = 35 7 = 13.3 S = 1.2 To find test stantistre t = 1313 x-el slun 13 - 1.2 3 t - 1.47go . p-value = P(+34 71147go) = 0.0742 .. The powalue is 0.0742 2 In the test =) The t test above what is the standardized statistic? standardized fogt statutic = 1.4790 - calculate in Que ③ Give Ho: p2, 80% and Ha <80% determine whether the hypothests te stegt is left tailed, right tailed or two tailed A. left tailed -

for Griven - ł = 81.5 s = 1012 n - 39 constmet goo% confidence in tervel population mean rest score el (I - tanina s calle 7 + tants d coil, n = 39 taling - to.os, 38 686 3052 = 1.686 in 81.5- 11686 10.2 cepL 81.5+ 1.686 34 AC 78.7462 (el 2 8412538) -90% confodence interrel : (78,7462,34 12538) 5 Give the sume sample statistic which Tevel of confidence interval will pardue the narroweg 1 confidence internet, Confidence interal for population a mean el ł I talina, s un where tx12in-1 to entical valve corresponding to level of sigrifocomec. larger the latt level of con Focleone wider the confidence in terrat

Thus to the confidence internal corresporching 95% is the widest Ans. A. 95% The result of a recent stucky show that the proportion of people in the United Stectes who we seatbelts when riding ina car or prick is go%94% Area researcher than wout to know If this is different prom the current percentage . Ho: p = 94% Hai e 7 99% OR Ho : P = ogo.gy Ha! P ergoo.gy.