question archive 16)Which type of error occurs because a sample gives incomplete information about a population? (a) Data-entry error (b) Nonsampling error (c) Sampling error (d) Interviewer error 17) An experiment in which the experimental unit(or subject)does not know which treatment he or she is receiving is called a (a) randomized block design (b) matched-pairs design (c) single-blind experiment (d) double-blind experiment 18) To help asses student learning in my son's middle school class, his teacher implementedpre-andpost-testsforherstudents
16)Which type of error occurs because a sample gives incomplete information about a population? (a) Data-entry error (b) Nonsampling error (c) Sampling error (d) Interviewer error 17) An experiment in which the experimental unit(or subject)does not know which treatment he or she is receiving is called a (a) randomized block design (b) matched-pairs design (c) single-blind experiment (d) double-blind experiment 18) To help asses student learning in my son's middle school class, his teacher implementedpre-andpost-testsforherstudents
Subject:StatisticsPrice: Bought3
16)Which type of error occurs because a sample gives incomplete information about a population?
(a) Data-entry error
(b) Nonsampling error
(c) Sampling error
(d) Interviewer error
17) An experiment in which the experimental unit(or subject)does not know which treatment he or she is receiving is called a
(a) randomized block design
(b) matched-pairs design
(c) single-blind experiment
(d) double-blind experiment
18) To help asses student learning in my son's middle school class, his teacher implementedpre-andpost-testsforherstudents. Aknowledgegainedscorewasobtained by taking the difference of the two test scores. What type of experimental design is this?
(a) Randomized block design
(b) Completely randomized design
(c) Matched-pairs design
(d) Survey
19) A drug company wanted to test a new medication. The researchers found 500adults aged 25-35 and randomly assigned them to two groups. The ?rst group received the new drug, while the second received a placebo. After one month of treatment, the percentage of each group whose symptoms decreased was recorded and compared. What type of experimental design is this?
(a) Matched-pairs design
(b) Single-blind design
(c) Randomized block design
(d) Completely randomized design
20) Distinguish between sampling error and non sampling error.
(a) Non sampling error is the error that results from under coverage, nonresponse bias, or data- entry errors. Sampling error is the error that results from the process of obtaining the data.
(b) Nonsamplingerroristheerrorthatresultsfromtheprocessofobtainingthedata. Sampling error is the error that results from under coverage, non response bias,or data-entry errors.
(c) Non sampling error is the error that results because a sample is being used to estimate information about a population. Sampling error is the error that results from under coverage ,non response bias ,or data-entry errors.
(d)Non sampling error is the error that results from the process of obtaining the data. Sampling error is the error that results because a sample is being used to estimate information about a population.
21) What is replication in an experiment?
(a) Replication is grouping together similar experimental units and then using random assignment.
(b) Replication is applying each treatment to more than one experimental unit.
(c) Replication is randomly assigning each experimental unit to a treatment.
(d) Replication is pairing up related experimental units.
22) When the effects of the explanatory variable upon the response variable cannot be determined ,then
(a) the claim is invalid.
(b) there is sampling error.
(c) confounding has occurred.
(d) replication has occurred.
23) Thegraphofadistributionofdatashowsthatthegraphisskewedtotheright. Which of the following is correct about the data?
(a) Mean < Median
(b) Mean > Median
(c) Mean ? Median
(d) No conclusion about the relative position of the mean and the median can be made.
24) SAT Math scores have a bell-shaped distribution with mean of 515 and standard deviationof114.
(a) What percentage of SAT scores is between 401 and 629?
(b) What percentage of SAT scores is less than 287 or greater than 629?
(c) What percentage of SAT scores is greater than 743?
25) At a tennis tournament a statistician keeps track of every serve. The statistician reported that the mean serve speed of a particular player was 95 miles per hour (mph) and the standard deviation of the serve speeds was 15 mph. If nothing is known about the shape of the distribution, give an interval that will contain the speeds of at least 89% of the player's serves.
26. Kelly has just completed her second semester in college. She earned a grade of A in her 5-hour Calculus course, a grade of B in her 4-hour Psychology course, a grade of C in her 3- hour Biology course, and a grade of D in her 2 - hour Speech Writing course. Assuming that A equals 4 points, B equals 3 points, C equals 2 points, D equals 1 point, and F is worth no points, determine Kelly's grade-point average for the semester.
27. The following data represent the amount of time (in minutes) a random sample of ten students took to complete their ?rst Statistics Test in Professor GG's MAT 210 class. 83, 65, 91, 75, 84, 45, 99, 79, 75, 38
(a) Find the Mean ,the Median and the Mode.
(b) Find the Standard Deviation.
28. A student scores 80.5 on a Physics test and 85 on a Mathematics test. The Physics test has a mean of 78 and a standard deviation of 7. The Mathematics test has a mean of 82 and a standard deviation of 9. If the data for both tests are normally distributed, on which test did the student score better relative to the other students in each class?
(a) The student scored the same on both tests.
(b) The student scored better on the Physics test.
(c) The student scored better on the Mathematics test.
(d) No conclusions can be made from the given data.
29. Assume the average selling price for houses in a certain county is $295,000 with a standarddeviationof$10,000.
(a) Calculate the z-score for a house that sells for $325,000.
(b) Using the empirical rule, determine the range of prices that includes 68% of the homes around the mean. Assume home price is normally distributed.
(c) Using Chebyshev's Theorem , determine the range of prices that includes at least 89% of homes around the mean.
30. At Center Hospital there is some concern about the high turnover of nurses. A survey was done to determine how long (in months) nurses had been in their current positions. The responses (in months) of 20nurseswere 4 5 7 8 8 11 12 14 20 22 24 25 26 27 28 29 31 36 42 50
Find (a) the 60th percentile and the 72nd percentile values of the data.
(b) the ?ve-number summary of the data.
(c) the inter quartile range of the data.
(d) lower and upper fences of the data.
(e) Is there any outlier? Explain.
