More than half of the 100 respondents have A type and positive attitude towards small cars
One hundred people were interviewed and classified according to their attitude toward small cars and their personality type. The results are shown in the table below.
Data set I and data set II have the same number of data points.
The boxplots shown above summarize two data sets, I and II. Based on the boxplots, which of the following statements about these two data sets CANNOT be justified?
There is greater variability in the lower 20 scores than in the higher 20 scores.
The figure above shows a cumulative relative frequency histogram of 40 scores on a test given in an AP Statistics class. Which of the following conclusions can be made from the graph?
between 43 and 48 inches
The statistics below provide a summary of the distrivbution of heights, in inches, for a simple random sample of 200 young children.
About 100 children in the sample have heights that are
The mean of the earnings of Company A is greater than the mean of the earnings of Company B
The stemplot below shows the yearly earnings per share of stock for two different companies over a sixteen-year period. Which of the following statements is true?
It cannot be determined from the information given.
The table above shows the sample size, the mean, and the median for two samples of measurements. What is the median for the combined sample of 47 measurements?
(graph) IQR 10-45, Median 22, fence @ 87.125, outlier @ 93
The histogram below displays the times, in minutes, needed for each chimpanzee in a sample of 26 to complete a simple navigational task. It was determined that the largest observation, 93, is an outlier since Q3 + 1.5(Q3-Q1)=87.125. Which of the following
There are more petal lengths that are less than 30 mm for species B than for species A
A botanist is studying the petal lengths, measured in millimeters,of two species of lilies. The boxplots above illustrate the distribution of petal lengths from two samples of equal size, one from species A and the other from species B. Based on the boxpl
She scored about equally well on both exams
Lauren is enrolled in a very large college calculus class. On the first exam, the class mean was 75 and the standard deviation was 10. On the second exam, the class mean was 70 and the standard deviation was 15, Lauren scored 85 on both exams. Assuming th
mean= 51 standard deviation=14
Suppose that the distribution of a set of scores has a mean of 47 and a standard deviation of 14. If $ is added to each score, what will be the mean and the standard deviation of the distribution of new scores?
9.895 cm to 10.105 cm
The lengths of individual shellfish in a population of 10,000 shellfish are approximately normally distributed with mean 10 centimeters and standard deviation .2 centimeter. Which of the following is the shortest interval that contains approximately 4,000
.132 inch ABOVE the mean
The distribution of the diameters of a particular variety of oranges is approximately normal with a standard deviation of .3 inch. How does the diameter of an orange at the 67th percentile compare with the mean diameter?
(graph) dip in the middle
The histograms below represent the distribution of five different data sets, each containing 28 integers, from 1 through 7, inclusive. The horizontal and vertical scales are the same for all graphs. Which represents the data set with the largest standard
39000
The weights of a population of adult male gray whales are approximately normally distributed with a mean weight of 18000 kilograms and a standard deviation of 4000 kilograms.......(too long to type)
.8
The correlation between two scores X and Y equals .8. If both the X scores and the Y scores are converted to z-scores, then the correlation between the z-scores for X and the z-scores for Y would be?
Scatterplot of B versus A
(too long to type)....Which of the following displays is least likely to be useful to readers for this purpose?
Because changing from centimeters to meters does not affect the value of the correlation, the correlation will remain .964
A high school physics teacher.....What effect will this have on the correlation of the two variables?
will have a negative correlation.
A delivery service places packages into large containers before flying them across the country.....The weights of the two containers on the same flight
-4.60
Least squares regression line was fitted to the weights (in pounds) versus age (in months) of a group of many young children. The equation is y=16.6 + .65t ... Which of the following is the residual weight, in pounds, for this child?
For each increase in temperature of 1 degree F, the estimated number of chirps per minute increases by 3.41
A wildlife biologist is interested in the relationship between the number of chirps per minute for crickets (y) and temperature. ... Which of the following best describes the meaning of the slope of the least squares regression line?
Since the correlation is not very high, the relationship between the amount of caffeine consumed and blood pressure is not linear
Each of 100 laboratory rats has available both plain water and mixture of water and caffeine in their cages....Which of the following conclusions is justified on the basis of this study?
Model B is appropriate, since the relationship betwen x and log y is linear
Two variables, x and y, were measured for a random sample of 25 subjects, and two separate regression models were fit to the data. Which of the following conclusions is correct?
There is a nonlinear relationship between x and y, and Regression II yields a better fit
Two measures x and y were taken on 18 subjects. The first two regressions, Regression I, yielded y=24.5 + 16.1x and had the following residual plot. Which of the following conclusions is best supported by the evidence above?
Assign 0-2 as watching and 3-9 as not watching
Suppose 30 percent of subscribers to a cable television service watch the shopping channel
stratified random
A high school stats class wants to conduct a survey to determine what percentage of students in the school would be willing to pay a fee for participating in after school activities....This is example of
He will be unable to tell whether the difference in party affiliation is related to differences in age or to the difference in gender
Jason wants to determine how age and gender are related to political party preference in his town....Of the following, which is the most important observation about Jason's plan?
To determine what proportion of fish in Lake Michigan are bass
In which of the following situations would it be most difficult to use a census?
Some registered voters who call might not vote in the election
A TV news editor would like to know how local registered voters would respond to the question, "Are you in favor of the school bond measure that will be voted on in an upcoming special election?" .. Which one of the following in the most obvious reason?
Every possible subset of the population, of the desired sample size, has an equal chance of being selected
Which of the following is NOT a characteristic of stratified random sampling?
An experiment can show a direct cause-and effect relationship, whereas an observational study cannot
Which of the following is a key distinction between well designed experiments and observational studies?
This study demonstrates clearly that seat belts save children from injury
A study of existing records of 27000 automobile accidents involving children in Michigan found that about 10 percent of children who were wearing a seatbelt were injured and that about 15 percent of children who were not wearing a seatbelt were injured. W
Randomly assign the subjects to two groups, giving the new drug to one group and the old drug to the other group, then compare the results.
A new medication has been developed to treat sleep-onset insomnia...Of the following, which is the best method for obtaining this information?
the new drug may affect men and women differently
A researcher wishes to test a new drug developed to treat hypertension...The major reason for separate assignment for men and women is that
by blocking car size
Automobile brake pads are either metallic or nonmetallic...This experiment would be best be done
Place each fly in its own numbered container in the order that it was caught.
A group of students has 60 houseflies in a large container and needs to assign 20 to each of three groups labeled A, B, C for an experiment...Which of the following methods will be most likely to result in three comparable groups of 20 houseflies each?