Introduction to Statistics — Unit test Answers
Thirty-six students at a large university were given a test to measure their intelligence quotient (IQ). A histogram of the IQ test scores is shown below. In each interval, the left endpoint is included in the interval, but not the right endpoint.
People at a library were asked how many states they had visited. Below is a stemplot of all of the data except for one value.
In some gymnastics meets, the score given to a gymnast is the mean of the judges’ scores after the highest and lowest scores have been tossed out. Nikita’s scores on the floor routine from all of the judges are shown below.7.50, 7.50, 7.75, 7.75, 8.00, 8.00, 8.00, 10.00
Thirty-six students at a large university were given a test to measure their intelligence quotient (IQ). A histogram of the IQ test scores is shown below. In each interval, the left endpoint is included in the interval, but not the right endpoint.
Twelve people were surveyed and asked how many people live in their residence. The results are summarized in the table below.
IQ scores are collected from a sample of students at a large university. The scores are shown below.99, 100, 105, 104, 102, 105, 105, 121, 104
The parallel dotplots below display the number of hours spent studying for a final exam by each of two classes.
In a recent survey, students were asked how long they play video games in one sitting. The interquartile range of the length of play times was 43 minutes. Which of the following is the best interpretation of this value?
Some teenagers collected trash for a beach cleanup. The data for the number of pounds of trash collected by each teenager are shown below.26, 26, 21, 22, 20, 25, 35
The stemplot below displays the grades (out of 30) that 26 students received on a quiz.
The parallel boxplots below display the quiz grades (out of 30) for two of Mrs. Smith’s statistics classes.
A statistics student gave a survey to students which asked how many first cousins they have. The data from the first nine responses are shown below.6, 2, 7, 8, 8, 8, 5, 10, 10
The distribution of ages of runners in a marathon is approximately normal. The oldest participant was 80 and the youngest was 13. Which of the following statements is true of the mean and median ages of the runners?
A sample of 50 students was surveyed about their time spent in front of a screen (laptop, tablet, phone, etc.). Each interval contains the left endpoint but not the right endpoint.
The heights of a sample of 15 students are recorded in the stemplot below.
The five-number summary of a data set is given below.Minimum: 3 Q1: 12 Median: 15 Q3: 16 Maximum: 20Which of the following equals 1.5(IQR)?
The parallel boxplots below display the bag weights of two different brands, A and B, of granola. Which brand of granola typically weighs more?
A simple random sample of 10 people was asked how many first cousins they have. The results are listed below.10, 19, 20, 13, 13, 2, 10, 8, 25, 10
Which of the following statements is true about the IQR, range, and standard deviation?
The stemplot below displays the arm spans, in centimeters, for 20 students.
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