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45 Cards in this Set
- Front
- Back
quantitative data can be considered categorical data..true or false?
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False
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A descriptive measure of a sample is a paramter (T/F)
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False
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we should determine our objectives of a study before we collect data. (T/F)
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True
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the numbers on a basketball jersey are an example of qualitative data. (T/F)
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True
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a data set that is skewed negative has most of the data values on the left with a few on the right. (T/F)
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False
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a stem and leaf plot is useful because it shows..
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the distribution AND contains all values
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the first quartile of a distribution can never be less than zero. (T/F)
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False...
ex: temperature |
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a population consists of the numbers 3, 8, and 4. The mean and median, respectively, are...
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5, 4
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the median and mode are not affect by outlier values. (T/F)
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True
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every data set has a mode. (T/F)
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False
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median is a measure of variability. (T/F)
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false
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range is sensitive to all data values. (T/F)
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False
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if we want the average of all the deviations fromt he mean of a data set, we can simply add teh deviations and divide by n. (T/F)
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false, you'd get 0 every time.
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The following measures of variation measure distance from mean: MAD, variance, IQR, MAD & variance
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MAD & variance
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the MAD of four number 6, 14, 14, 14 is equal to: 0, 1, 2, 3
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3
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the units of a population MAD for aproblem in which the units are feet are: feet squared, the absolute value of feet, feet, no units
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feet
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a population has three values: 3, 7, 5. Find the population variance: 0, 2.67, 1.63, 4, 2
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2.67
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a population consisted of the values 3, 7, 11, 11, 13. the population std. deviation is: 12.8, 3.58, 16, 4
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3.58
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a sample consisting of the numbers 3, 6, 9 has sample variance equal to 12.
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false, 9
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the numebr of hours a child spent watching TV over thh pas three day was 15, 3, 9. Compute sample std. dev: 24, 6, 3, 2
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6
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a std deviation can sometimes be larger in numerical value than a variance
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true
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the coefficient of variation computed from the three samples values 15, 20, and 25 would be equal to 25
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true
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95% of data values that conform to a bell shaped distribution will lie within how many std devs of the mean? 0, 1, 2, 3
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2
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the coefficient of variation computed from 3 sample values 25, 30, 35 would be equal to 20.
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false, 16.66
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student score = 70
class mean = 80 std dev = 5 the standard score is equal to 2. |
true
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positive kurtosis indicates more extreme values than expected in the tail of a distribution
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true
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a boxplot is a good way to show the mean
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false
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generally speaking, a stem and leaf plot cannot be constructed from a boxplot, but a boxplot can be constructed from a stem and leaf plot
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true
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not all mutually exclusive events are complementary
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true
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all complementary events are mutually exclusive
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true
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drawing an ace of spades and a three of hearts are complementary
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false
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the items in a sample space must be: complementary, exhaustive, random, comp and exhaustive
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exhaustive
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whats it the most common approach to determining probability
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relative
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when a probability is described in terms of the propportion of times that an event can be theoritically epxcted to occur, it is an example of relative frequency probability
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false, theoretical
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a couple palsn to have three kids assuming male/female birthday are equally likely, what is the probability that the couple will have at least one girl among the three children:
1/3, 2/3, 3/8, 7/8 |
7/8
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order matters when making a sample space
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true
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when one throws a die 1000 times and determines the probability of obtaining a six on a die is one-sixth, they used theoretical.
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false, relative
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3 pairs of socks, whats the prob that you will get a pair? 2/3, .2, .8, .75
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.2
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the distribution of people's heights is an example of a discrete probability distribution
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false
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the sum of the probabilites in a discrete probability distribution could total 1.2
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false it has to be 1
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probabilities associated with random variables must all be equal
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false
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x=10, 9, 8, 7, 6. f(x)=3, 2, 1, 2, 2
e(x) = ? 8, 8.2, 9, 7.8 |
8.3
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x=1, 3, 5. p(x)=.4, .2, .4
variance = ? 1.6, 4, 8/3, 3.2 |
3.2
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x=20, 30, 60
p(x)=.5, .4, .1 std dev(x)=? 4.29, 18.4, 19, 361 |
19
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non-random samples involve unequal probabilities
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true
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