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20 MCQ of Medical

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Question;Question 1 of 20 1.0 Points;A lab technician is tested for her consistency by taking multiple measurements;of cholesterol levels from the same blood sample. The target accuracy is a;variance in measurements of 1.2 or less. If the lab technician takes 16 measurements;and the variance of the measurements in the sample is 2.2, does this provide;enough evidence to reject the claim that the lab technician?s accuracy is;within the target accuracy?;State the null and alternative hypotheses.;A. H0: s2? 1.2, H1: s2? 1.2;B. H0: s2? 1.2, H1: s2 = 1.2;C. H0: s2 1.2.;Question 2 of 20 1.0 Points;Smaller p-values indicate more evidence in support of the;A. alternative hypothesis;B. the reduction of variance;C. quality of the researcher;D. null hypothesis.;Question 3 of 20 1.0 Points;The hypothesis that an analyst is trying to prove is called the;A. quality of the researcher;B. alternative hypothesis;C. level of significance;D. elective hypothesis.;Question 4 of 20 1.0 Points;A severe storm has an average peak wave height of 16.4 feet for waves hitting;the shore. Suppose that a storm is in progress with a severe storm class;rating. Let us say that we want to set up a statistical test to see if the wave;action (i.e., height) is dying down or getting worse. If you wanted to test the;hypothesis that the waves are dying down, what would you use for the alternate;hypothesis? Is the P-value area on the left, right, or on both sides of the;mean?;A. H1: is not equal to 16.4 feet, the P-value area is on the right of the mean;B. H1: is greater than 16.4 feet, the P-value area is on the left of the mean;C. H1: is greater than 16.4 feet, the P-value area is on both sides of the mean;D. H1: is less than 16.4;feet, the P-value area is on the left of the mean.;Question 5 of 20 1.0 Points;A manufacturer of flashlight batteries took a sample of 13 batteries from a;day?s production and used them continuously until they failed to work. The life;lengths of the batteries, in hours, until they failed were: 342, 426, 317, 545;264, 451, 1049, 631, 512, 266, 492, 562, and 298.;At the.05 level of significance, is there evidence to suggest that the mean;life length of the batteries produced by this manufacturer is more than 400;hours?;A. No, because the p-value for this test is equal to.1164;B. Yes, because the test value 1.257 is less than the critical value 2.179;C. No, because the test value 1.257 is greater than the critical value 1.115;D. Yes, because the test value 1.257 is less than the critical value 1.782.;Question 6 of 20 1.0 Points;Results from previous studies showed 79% of all high school seniors from a certain;city plan to attend college after graduation. A random sample of 200 high;school seniors from this city reveals that 162 plan to attend college. Does;this indicate that the percentage has increased from that of previous studies?;Test at the 5% level of significance.;What is your conclusion?;A. Cannot determine;B. More seniors are going to college;C. Reject H0. There is enough evidence to support the claim that the proportion;of students planning to go to college is now greater than.79.;D. Do not reject H0. There;is not enough evidence to support the claim that the proportion of students;planning to go to college is greater than.79..;Question 7 of 20 1.0 Points;In an article appearing in Today?s Health a writer states that the average;number of calories in a serving of popcorn is 75. To determine if the average;number of calories in a serving of popcorn is different from 75, a nutritionist;selected a random sample of 20 servings of popcorn and computed the sample mean;number of calories per serving to be 78 with a sample standard deviation of 7.;State the null and alternative hypotheses.;A. H0: 75, H1: 75;C. H0: = 75, H1:? 75;D. H0: 75, H1: > 75.;Question 8 of 20 1.0 Points;A type I error occurs when the;A. null hypothesis is;incorrectly rejected when it is true;B. sample mean differs from the population mean;C. null hypothesis is incorrectly accepted when it is false;D. test is biased.;Question 9 of 20 1.0 Points;The form of the alternative hypothesis can be;A. neither one nor two-tailed;B. one-tailed;C. one or two-tailed;D. two-tailed.;Question 10 of 20 1.0 Points;A lab technician is tested for her consistency by taking multiple measurements;of cholesterol levels from the same blood sample. The target accuracy is a;variance in measurements of 1.2 or less. If the lab technician takes 16;measurements and the variance of the measurements in the sample is 2.2, does;this provide enough evidence to reject the claim that the lab technician?s;accuracy is within the target accuracy?;At the a =.01 level of significance, what is your conclusion?;A.;Reject H0. At the =.01 level of significance, there is not enough evidence to;support the claim that this technician?s true variance is larger than the;target accuracy.;B. Do not reject H0. At the =.01 level of significance there is not sufficient;evidence to suggest that this technician?s true variance is greater than the;target accuracy.;C. Cannot determine;D. Reject H0. At the =.01;level of significance, there is enough evidence to support the claim that this;technician?s variance is larger than the target accuracy..;Question 11 of 20 1.0 Points;The null and alternative hypotheses divide all possibilities into;A. two sets that overlap;B. two sets that may or may not overlap;C. as many sets as necessary to cover all possibilities;D. two non-overlapping;sets.;Part 2 of 3 -;Question 12 of 20 1.0 Points;A survey determines that mint chocolate chip is the favorite ice cream flavor;of 6% of consumers. An ice cream shop determines that of 240 customers, 18;customers stated their preference for mint chocolate chip.;Find the P-value that would be used to determine if the percentage of customers;who prefer mint chocolate chip ice has increased at a 5% level of;significance.;.1639;P-value: Round your answer to four decimal places as necessary.;Question 13 of 20 1.0 Points;A medical doctor wishes to test the claim that the standard deviation of the;systolic blood pressure of deep sea divers is greater than 450. To do so, she;selected a random sample of 25 divers and found s = 468.;Assuming that the systolic blood pressures of deep sea divers are normally distributed;the doctor would perform a chi-square test to test her research hypothesis. In;that case, what is the test value that she would compute. 5.095;Place your answer, rounded to 3 decimal places, in the blank. For example;34.567 would be a legitimate entry.;Question 14 of 20 1.0 Points;The ABC battery company claims that their batteries last at least 100 hours, on;average. Your experience with their batteries has been somewhat different, so;you decide to conduct a test to see if the company's claim is true. You believe;that the mean life is actually less than the 100 hours the company claims. You;decide to collect data on the average battery life (in hours) of a random;sample of n = 20 batteries. Some of the information related to the hypothesis test;is presented below.;Test of H0: 100 versus H1: 100;Sample mean 98.5;Std error of mean 0.777;Assuming the life length of batteries is normally distributed, if you wish to;conduct this test using a.05 level of significance, what is the critical value;that you should use? Place your answer, rounded to 3 decimal places in the;blank. For example, -1.234 would be a legitimate entry. -1.645;Question 15 of 20 1.0 Points;At a university, the average cost of books per student has been $550 per;student per semester. The Dean of Students believes that the costs are;increasing and that the average is now greater than $550. He surveys a sample;of 40 students and finds that for the most recent semester their average cost;was $630 with a standard deviation of $120. What is the test value for this;hypothesis test?;4.216;Test value: Round your answer to two decimal places as necessary.;Question 16 of 20 1.0 Points;A firm that produces light bulbs claims that their lightbulbs last 1500 hours;on average. You wonder if the average might differ from the 1500 hours that the;firm claims. To explore this possibility you take a random sample of n = 25;light bulbs purchased from this firm and record the lifetime (in hours) of each;bulb. You then conduct an appopriate test of hypothesis. Some of the;information related to the hypothesis test is presented below.;Test of H0: = 1500 versus H1: 1500;Sample mean 1509.5;Std error of mean 4.854;Assuming the life length of this type of lightbulb is normally distributed;what is the p-value associated with this test? Place your answer, rounded to 3;decimal places, in the blank. For example, 0.234 would be a legitimate;entry. 0.0503;Question 17 of 20 1.0 Points;Suppose a firm that produces light bulbs wants to know whether it can say that;its light bulbs typically last more than 1500 hours. Hoping to find support for;their claim, the firm collects a random sample of n = 25 light bulbs and;records the lifetime (in hours) of each bulb. The information related to the;hypothesis test is presented below.;Test of H0: 1500 versus H1: > 1500;Sample mean 1509.5;Std error of mean 4.854;Assuming the life length of this type of lightbulb is normally distributed, if;you wish to conduct this test using a.05 level of significance, what is the;critical value that you should use? Place your answer, rounded to 3 decimal;places in the blank. For example, 1.234 would be a legitimate entry.;Part 3 of 3 -;1.645;Question 18 of 20 1.0 Points;The p-value of a test is the smallest level of significance at which the null;hypothesis can be rejected.;True;False.;Question 19 of 20 1.0 Points;The probability of making a Type I error and the level of significance are the;same.;True;False.;Question 20 of 20 1.0 Points;Using the confidence interval when conducting a two-tailed test for the;population mean, we do not reject the null hypothesis if the hypothesized value;for falls between the lower and upper confidence limits.;True;False.="msonormal">

 

Paper#58273 | Written in 18-Jul-2015

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