AP Stats test questions on final

b

based on the histogram, which of the following must be true a. the minimum price is 250,000 b. the median price is not greater than 750,000 c. the mean price is between 500,00 and 750,00 d. the upper quartile of the prices is greater than 1,500,000 e. the maximum price is 2,500,000

a

a company determines the mean and standard deviation of the number of sick days taken by its employees in one year. which of the following is the best description of standard deviation? a. approximately the mean distance between number of sick day s taken by individual employees and the mean number of sick days b. approximately the median distance between the number of sick days taken by an individual and the median number of sick days taken by all employees c. the distance between the greatest number of sick days by an employee and the mean number of sick days taken by all employees d. the number of days separating the fewest sick days taken and the most sick days taken the number of days separating the fewest sick days taken from the most sick days when considering the middle 50 percent of the distribution

b

a newspaper editor wants to investigate whether residents of the study support a proposal to build a new high school football stadium. the editot hires a send a survey polling firm to conduct a survey and requests that a sample of 500 residents be selected using stratified sampling design based on the voting within the city. which of the following methods will achieve the desired sampling design? a. send a survey to all city residents and use the first 500 returned surveys for a sample b. select a random sample from each voting district based on the the proportion of city residents in that district so that a total of 500 is obtained c. select one voting district at random and then select a random sample of 500 from the selected voting district d. alphabetize the list of all city residents and then select the first 500 residents on the list classifying those selected by voting district e. select the first 500 citizens who attend the next high school football game

d

a produce supplier ships boxes of produce to individual customers. the distribution of weights of shipped boxes is approximately normal with mean 36 pounds and standard deviation 4 pounds. which expression represents the weight, in pounds, at the 75th percentile of distribution? a.-1.96(4)+36 b. -0.25(4)+36 c. 0.25(4)+36 d. 0.67(4)+36 e. 0.75(4) +36

d

a residual plot is useful because I. it will help us to see whether our model is appropriate II. it might show a pattern in the data that was hard to see in the original scatterplot III. it will clearly identify outliers a. I only b. II only c. III only d. I and II only e. none

d

a sleep time of 15.9 hours per day for a newborn baby is the 10th percentile of the distribution of sleep times for all newborn babies. assuming the distribution is normal with standard deviation 0.5 hour, approximately what is the mean sleep time, in hours per day for newborns? a. 15.1 b. 15.3 c. 16.3 d. 16.5 e. 16.7

a

based on the scatterplots, for which gender does there appear to be evidence the more time a lion cub is playing, the sooner the cub is likely to begin hunting? a. for female cubs only b. for male cubs only c. for both males and female cubs, with equal evidence d. for both male cubs and female cubs, with more evidence for female cubs than male cubs e. for neither male cubs nor female cubs

d

given the definition of an outlier and the given information, which of the following can be concluded? a. the median is greater than the mean, and the distribution has no outliers b. the median is greater than the mean, and the distribution has two outliers c. the median is greater than the mean and the distribution has only one outlier d. the medina is less than the mean and the distribution has two outliers e. the median is less than the mean and the distribution has only one outlier

c

in driving a car the events of driving over the speed limit and getting a speeding ticket a. disjoint b. independent c. neither d. both

d

measurements of water quality were taken from a river downstream from an abandoned chemical dumpsite. concentrations of a certain chemical were obtained from 9 measurements taken at the surface of the water, 9 measurements taken at mid-depth of the water and 9 measurements taken at the bottom of the water. what type of study was conducted and what is the response variable of the study? a. an experiment was conducted and the response variable is the concentration of the chemical b. an experiment was conducted and the response variable is the depth of water c. a census was conducted and the response variable is the depth of water d. an observational study was conducted and the response variable is the concentration of the chemical e. an observational study was conducted and the response variable is the depth of water

b

opinion polling organizations contact their correspondents by sampling random telephone numbers. assume that interviewers can now reach 73% of US households while the percentage of those contacted who agree is to cooperate with the survey is 37%. what is the probability of failing to contact a household or contacting a household but not getting them to agree to interview? a. 0.467 b. 0.730 c. 0.830 d. 0.540 e. 0.170

b

predicted height= 0.29+0.48(age) which of the following is the best interpretation of the slope of the regression line? a. the height increases, on average, by 1 meter each 0.48 year b. the height increases, on average by 0.48 meter each year c. the height increases, on average by 0.29 meter each year e. the difference between the actual height and the predicted height on average 0.48 meter per year

b

residuals are.. a. variation in the data that is explained by the model b. the difference between observed responses and values predicted by the model c. possible models not explored by the researcher d. data collected from individual that is not consistent with the rest of the group e. none of these

b

staff members of a high school want to obtain an estimate of the average number of years teachers in the state have been teaching. at an educational conference attended by many teachers in the state the staff members randomly selected 50 conference attendees and asked the attendees how long they have been teaching. which of the following describes the sample and the population to which would be most reasonable for the staff members to generalize results? a. the sample is the 50 conference attendees and the population is all the teachers in the state b. the sample is the 50 conference attendees and the population is the total conference attendees d. the sample is all conference attendees and the population is the 50 conference attendees e. the sample is the average number of years that all the conference attendees have taught and the population is all conference attendees

b

suppose that a normal model describe student scores in a history class. parker has a z score of 2.5 this means that Parker... a. has a score that is 2.5 times the average for the class b. is 2.5 standard deviations above the average for the class c. has a standard deviation of 2.5 d. is 2.5 points above average for the class e. the standard deviation

b

suppose that a normal model described student scores in a history class. Parker has a standard score (z score) of 2.5. this means that parker... a. has a score that is 2.5 times the average of his class b. is 2.5 standard deviations above average for the class c. has a standard deviation of 2.5 d. is 2.5 points above average for the class e. none of the above

a

the mean number of hours worked for 30 males was 6, and for 20 females was 9. the overall mean number of hours worked... a. 7.2 b. 7.5 c. 6.5 d. none e. cannot be determined

c

the scientist concluded that he new fertilizer was more effective than the other fertilizers for all vegetables. why is the scientist's conclusion not appropriate? a. the study was observational so cause and effect could not be concluded b. the study was observational so no replication was used in the study c. the experiment only included green beans so the results do not generalize for all vegetables d. the experiment did not group seedlings into blocks by the variety of beans e. the experiment lacked a control group that did not use any fertilizer

e

which is true I. random scatter in the residuals indicates a model with higher predictive power II. if two variables are strongly associated then the correlation between them will near +1.0 or -1.0 III. the higher the correlation between two variables the more likely the association is based in cause and effect a. I only b. II only c. III only d. I,II, and III e. none

b

which of the following is defined as the 50th percentile? a. the mean b. the median c. the mode d. the IQR e. the standard deviation

b

which of the following is defined as the 50th percentile? a. the mean b. the median c. the mode d. the IQR e. the standard deviation

e

which of the following shows no association between age and preferred method of eating ice cream?

d

which of the following variables would most likely follow a normal model? a. heights of singers in a co-ed choir b. family income c. scores on an easy test d. heights of adult male elephants e. all of those