Can You Pass This AP Statistics Exam? Quiz

5 Questions | Total Attempts: 703

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Can You Pass This AP Statistics Exam? Quiz

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Questions and Answers
  • 1. 
    Researchers in the Southwest studying tortoise habitat collected the following data.  If a tortoise is selected at random, let A = the tortoise is a female, and B = the tortoise is a Morafka.  Which answer appropriately interprets the value of P(B|A)? Species Male Female Agassiz 18 33 Morafka 12 15
    • A. 

      31.3% is the probability that a randomly selected Morafka tortoise is a female tortoise.

    • B. 

      31.3% is the probability that a randomly selected female tortoise is a Morafka tortoise.

    • C. 

      19.2% is the probability that a randomly selected Morafka tortoise is a female tortoise.

    • D. 

      19.2% is the probability that a randomly selected female tortoise is a Morafka tortoise.

    • E. 

      31.3% is the probability that a randomly selected tortoise is a female tortoise.

  • 2. 
    Which of the following is not an advantage of stratified random sampling over simple random sampling?
    • A. 

      When done correctly, a stratified random sampling process has less variability from sample to sample than a simple random sample.

    • B. 

      When done correctly, a stratified random sample can provide, with a smaller sample size, an estimate that is just as reliable as that of a simple random sample with a larger sample size.

    • C. 

      A stratified random sample provides information about each stratum in the population as well as an estimate for the population as a whole, and a simple random sample does not.

    • D. 

      When done correctly, a stratified random sample is less biased than a simple random sample.

    • E. 

      When done correctly, a stratified random sample can provide a more reliable estimate than a simple random sample using the same sample size.

  • 3. 
    The correlation between height in inches and weight in pounds for a particular class is 0.65.  If the heights are converted from inches to centimeters, what will the correlation be? (1 in.  = 2.54 cm)
    • A. 

      -0.65

    • B. 

      -0.26

    • C. 

      0.10

    • D. 

      0.26

    • E. 

      0.65

  • 4. 
    Researchers wish to test how rangelands growth is affected by wildfire.  A very large open area is divided into 28 equally sized plots and subjected to a controlled burn.  One year later, the researchers calculate the percentage of grass returned in each plot after the fire damage.  The average percentage return for these 28 plots was 58.5% with a standard deviation of 6.5%.  Which of the following represents a 95% confidence interval to estimate the average proportion of grass return one year after fire?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 5. 
    A spreadsheet contains a data set that consists of 100 values such that IQR > variance.  However, these values must be converted using the following formula:  NewValue = 2(OldValue)+10.  Which of the following statements is true about the data set consisting of the NewValues?
    • A. 

      The IQR has been increased by 10 units.

    • B. 

      The IQR is now less than the variance.

    • C. 

      The IQR is now double its previous size.

    • D. 

      The IQR has been doubled and then increased by 10 units.

    • E. 

      The IQR has been cut in half.