WorksheetsAP Stats Chapter 1&4 Test Review
Total questions: 16
Worksheet time: 48mins
You record the age, marital status and earned income of 1463 women. The number and type of variables you have recorded is
3 quantitative, 0 categorical
2 quantitative, 1 categorical
1 quantitative, 2 categorical
0 quantitative, 3 categorical
The percentage of actresses who were younger than 30 when they won "best actress" is closest to
7%
22%
29%
50%
Which statement about this distribution is NOT correct?
The histogram is right-skewed
The median age is less than 40 years
The mean is greater than the median
The IQR is approximately 60 years
The mean salary for all employees at store A is $35,000. The mean salary for all employees at store B is $41,000. What must be true for the mean salary of all employees?
It must be $38,000
It must be larger than the median salary
It could be any number between $35,000 and $41,000
It cannot be larger than $40,000
The dotplots show the average number of minutes two groups of students spent exercising. Which statement is not true?
The median for seniors is the same as the median for freshmen
The standard deviation is larger for seniors than for freshmen.
The IQR for freshmen is 30
The IQR for seniors is 30
Which statement is true about the amount of money students in this survey spent on homecoming?
A majority of students spent between $40 and $80
The student who spent $100 is an outlier in this group.
The mean amount spent for homecoming is $40.
The distribution is skewed right.
A data set has the following 5-number summary:
Min = 3; Q1 = 18; Med = 24; Q3 = 30; Max = 50
Which statement is true?
There are no outliers
3 is an outlier but 50 is not.
50 is an outlier, but 3 is not.
Both 3 and 50 are outliers
The distribution of scores on a test are fairly symmetric and unimodal with a peak at 80. One student who was absent then takes the test and scores 25 on the test. Which summary statistic would be least affected by the addition of this new data point?
Standard deviation
Mean
IQR
Range
A new headache remedy was given to a group of 25 subjects who had headaches. Four hours after taking the new remedy, 20 of the subjects reported that their headaches had disappeared. From this information you conclude
that the remedy is effective for the treatment of headaches.
nothing, because the sample size is too small.
nothing, because there is no control group for comparison.
that the new treatment is better than aspirin.
that the remedy is not effective for the treatment of headaches.
A maple sugar manufacturer wants to estimate the average trunk diameter of Sugar Maple trees in a large forest. There are too many trees to list them all and take a SRS, so he divides the forest into several hundred 10 meter by 10 meter plots, selects 25 plots at random, and measures the diameter of every Sugar Maple in each one. This is an example of a
multistage sample.
stratified sample.
simple random sample.
cluster sample.
convenience sample.
To test the effect of music on productivity, a group of assembly line workers are given portable mp3 players to play whatever music they choose while working for one month. For another month, they work without music. The order of the two treatments for each worker is determined randomly. This is
an observational study.
a matched pairs experiment.
a completely randomized experiment.
a block design, but not a matched pairs experiment.
impossible to classify unless more details of the study are provided.
A nutritionist wants to study the effect of storage time (6, 12, and 18 months) on the amount of vitamin C present in freeze dried fruit when stored for these lengths of time. Six fruit packs were randomly assigned to each of the three storage times. The treatment, experimental unit, and response variable are, respectively:
A specific storage time, amount of vitamin C, a fruit pack
A fruit pack, amount of vitamin C, a specific storage time
Random assignment, a fruit pack, amount of vitamin C
A specific storage time, a fruit pack, amount of vitamin C
A specific storage time, six fruit packs, amount of vitamin C
We wish to draw a sample of 5 without replacement from a population of 50 households. Suppose the households are numbered 01, 02, . . . , 50, and that the relevant line of the random number table is
11362 35692 96237 90842 46843 62719 64049 17823.
Then the households selected are
households 11 13 36 62 73
households 11 36 23 08 42
households 11 36 23 23 08
households 11 36 23 56 92
households 11 35 96 90 46
A college admissions officer wants to know what the most important factors are that high school seniors consider when they choose where to apply to college. She conducts a telephone survey with a simple random sample of all applicants to her college.
Identify the population and the sample in this situation.
population = all students at the college
sample = all applicants to the college
population = high school seniors
sample = all applicants to the college
population = all applicants to the college
sample = applicants to the college who take the survey
population = high school seniors
sample = applicants to the college who take the survey
In one study on the effect that drinking soda has on weight level, an SRS of 300 subjects who admitted to drinking at least one soda per day had their weights compared with those of an SRS of 300 people who claimed to not drink soda. In a second study, an SRS of 300 subjects were served at least one soda per day for 6 months, while an independent SRS of 300 others were chosen to receive no soda for 6 months, with weights compared after 6 months.
The first study is an experiment, while the second is an observational study.
The first study is an observational study, while the second is an experiment.
Both studies are experiments.
Both studies are observational studies.
Which of the following are important in the design of experiments? (Check all correct answers)
the use of two or more treatments for comparison
randomization in assigning subjects to different treatments
the use of a placebo
replication of the experiment by using a large number of subjects
