PARTINMusiple Choice Questioe Civcle the coevect answer, Sabmis ya awsws to the
ID: 3067829 • Letter: P
Question
PARTINMusiple Choice Questioe Civcle the coevect answer, Sabmis ya awsws to the wwww.er shest geven in page 2 Each correct answer will receive 1.5 points 1f no answer is clearty circled in the answer sheet, 1. 500 batterics is tested and the average tifetime of this sample is fionand to be 225 hoxus The 225 ous the vahue of a: A company has developed a new tbattery and wants to estinste its aveage lifetine. A (e) census. 2. A researcher wishes to estimate the textbook costs of first-year students at the U niversity of Sharjah. To do so, he recorded the textbook cost of 200 first-year students and found that their average textbook cost was AED 250 per semester. The variable of interest to the researcher is (a) name of university. (b) textbook cost. (c) class rank. (d) number of students (e) none of the above. 3. 9 students were asked to measure their pulses for 30 seconds and multiply by two to get their one-minute pulse rates. The results were: 55, 62, 64, 66, 70, 70, 74, 76, 160 The pulse rate of 160 is an outlier. The student forgot to multiply by two. For each of the following statistics, specify whether it would increase, decrease or remain the same after the outlier is corrected (a) Mean decreases, median remains the same and standard deviation decreases. (b) Mean decreases, median increases and standard deviation increases. (c) Mean increases, median decreases and standard deviation increases. (d) Mean increases, median remains the same and standard deviation decreases. (e) Mean decreases, median remains the same and standard deviation increases. 3/16Explanation / Answer
(1)
Here 225 hours shows the average battery lifetime of 500 batteries so it is sample statistics.
Hence, correct option is b.
(2)
Correct option is b.
(3)
Correcting outlier will decrease one value so mean will decrease.
Median will remain same because it remain unaffected by outliers.
Standard deviation will decrease because one value will decrease.
Correct option is a.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.