Biology Forums - Study Force

A student took a chemistry exam where the exam scores were mound-shaped with a mean score of 90 and a standard deviation of 64 . She also took a statistics exam where the scores were mound-shaped, the mean score was 70 and the standard deviation was 16 . If the student's grades were 102 on the chemistry exam and 77 on the statistics exam, then:
 a. the student did relatively better on the chemistry exam than on the statistics exam, compared to the other students in each class.
  b. the student did relatively better on the statistics exam than on the chemistry exam, compared to the other students in the two classes.
  c. the student's scores on both exams are comparable, when accounting for the scores of the other students in the two classes.
  d. it is impossible to say which of the student's exam scores indicates the better performance.
  e. the student did relatively the same on both exams.

Q. 2

In comparing two independent means when the 's are unknown, we may use the standard normal distribution.
  Indicate whether the statement is true or false

Q. 3

Expressed in percentiles, the interquartile range is the difference between the:
 a. 20 and 80 values
  b. 45 and 95 values
  c. 25 and 75 values
  d. 20 and 70 values
  e. 10 and 90 values

Q. 4

Confidence interval for the difference between the means of two populations using independent sampling may contain negative values.
  Indicate whether the statement is true or false

Q. 5

Which one of the values below represents the upper quartile of the data set 10, 12, 16, 7, 9, 7, 41, and 14?
 a. 8
  b. 15.5
  c. 7
  d. 24
  e. 10

Q. 6

The z-distribution is used when two dependent means are to be compared.
  Indicate whether the statement is true or false

Q. 7

Which one of the values below represents a lower quartile for the data set 23, 24, 21, and 20?
 a. 22.0
  b. 22.5
  c. 20.25
  d. 23.5
  e. none of these

Q. 8

When the means of two unrelated samples are used to compare two populations, we are dealing with two dependent means.
  Indicate whether the statement is true or false

Q. 9

The left and right ends of the box in a box and whisker plot represent the 25th and 75th percentiles, respectively.
  Indicate whether the statement is true or false

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