Review
Which statistical measure would change the most if the outlier was removed from this data set: 86, 84, 80, 48, 90, 75, 88?
Range
Given the following data set: 1 14 15 16 17 18 19 21 25 33 41 According to the 1.5(IQR) rul
the only outlier is 41.
The scores of a statistics quiz are fairly normally distributed with mean of 14 points, and standard deviation 1 point. If you got 16 points, what is your z-score on this quiz?
(16-14)/1 = 2
The times taken for 20 people to complete a puzzle were recorded to the nearest minute as follows:23, 27, 24, 18, 20, 25, 58, 23, 27, 19, 20, 25, 23, 22, 26, 26, 23, 19, 21, 26By how much is the mean decreased if the outlier is not included?
1.75
A jar contains 1 blue marble, 11 yellow marbles, and 8 green marbles. What is the probability of randomly choosing a blue marble, replacing it, and then choosing a blue marble again?
1/400
Bailey tossed a coin 20 times. The results were 12 heads and 8 tails. What is the experimental probability of tossing tails?
2/5
The table shows the number of students who attended the Spanish Club meetings during the school year. To the nearest tenth, what is the mean absolute deviation of the data?
3.8
Given data set: -3, 5, 10, 12, 14, 18, 24, 26, 49, 60 Which of the following statements is true regarding this data?
60
The temperatures (in °F) recorded at Exton at noon on each day for two weeks were as follows:81, 78, 77, 75, 80, 82, 84, 78, 74, 75, 49, 71, 76, 80If the outlier is excluded, what was the mean temperature?
77.8
What is the mode of the data set?
8
What percent of the data lies between the first quartile, Q1, and the Median?
About 25%
Antwan wants to know how often the residents in his dorm go to the beach. Which sampling method will give valid results?
Asking students in three random rooms from each floor in his dorm.
Which statement explains why it is reasonable to infer which doctor has the greater variability in weekly patients?
Dr. Lind; the interquartile range is greater
. An online store had daily sales of $25,696, $33,450, $29,080, $28,000, $33,400, $27,604, and $25,228. Which measure of center makes the store appear the most profitable?
Range
The number of ringtones that 12 students have on their cell phones is 2, 2, 3, 5, 6, 8, 14, 6, 4, 2, 1, and 4. Which of the following statements is not supported by these data?
H alf the phones have 4 or less ringtones
Carlos recorded his friends' scores while playing the video game "Golden Eye Commander". Most of his friends' scores were between 9 and 12. One score, however, was 28, and Carlos identified it as an outlier. What should Carlos do with the score of 28 when recording this data?
Keep the outlier as it may help to explain a new strategy for playing the game.
Which one of the following measures is resistant to outliers?
Median
If I change one of the 8's in the data set to 18, how would that change the mean?
The mean would be higher
If I change one of the 8's in the data set to 18, how would that change the median?
The median would remain the same
Taj has a choice of water, iced tea, or lemonade; with lemon or lime twist; served in a small or large glass. How many more choices will he have if the drink can be served with or without a straw? Explain.
Twice as many
Which measure of central tendency is most affected by outliers?
mean
Which measure of center is best to use to describe two data sets that are both not symmetric?
median
Which statement accurately compares the theoretical and experimental probability of tossing tails in Exercise 8?
theoretical probability > experimental probability
Heights of a kindergarten class are fairly normally distributed with mean 45 inches, and standard deviation 2 inches. If Sophie 40 inches tall, is she unusually short?
yes
To determine priority for zoo improvements, every tenth visitor is surveyed at the park entrance. Out of 180 visitors, 22% said they would like to have more walking paths. The zoo manager concludes that about one-fifth of all park visitors would like to have more walking paths. Is this conclusion valid? Justify your answer
yes