evered io the class, and the 10 subjects in 2.30 which of the ollowing is comect

Question

evered io the class, and the 10 subjects in 2.30 which of the ollowing is comect based on the information? A Pyalue 0933 and she will fail to reject Ho & Pvalue 00107, and she will reject Ho 00307, and she O. P-value 0 9893 and she will reject Ho (39 asey is trying to use # 90% corMence interval to estimate the average ACT scores of students in his college He rand Selected S stadens and recorded their ACT score there is no information known about the population standard deviation, whikch of the following is TRUE A He should use a t-confidence interval with t*-1.69 B. He should use a z-confidence interval with 2*-1.699 C. He should use a -confidence interval with t® " 1.699 D. He should use a z-confidence interval with 1.645 (4) In toonfidence interval, margin of error is defined as t. which of the-ing wil reduce the margin of error, so that a narrower Confidence Interval will be produced? Increase confidence level C%. B. Increase sample size n. C. Decrease sample size n D. Make sure sample standard deviation s is calculated correctly (5) Sophie is using a t test to analyze her research data with significance level 0.05. She wants to see if there is evidence that average lead level for a lake is higher than 15 ppm. After she collected data from a SRS of 25 spots of the lake, the samples are tested and data are collected. When she analyzed the data, she calculated her test statistic t 1.89. Which of the following is correct based on the information? P-value 0.05,and there is not enough evidence that the lead level for the lake s igh than 15 ppm

Explanation / Answer

5. Degree of freedom =n-1=25-1=24

Using degree of freedom and t value, from the table,

p value =0.0354

Ans= (D) p value >0.05,and there is not enough evidence that the lead level for the lake is higher than 15ppm.

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