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WorksheetsPraxis Prep Statistics
Total questions: 20
Worksheet time: 53mins
Tests are 60% of the grade, Quiz 15%, Homework is 10% of the grade, and Classwork is 15% of the grade.
What is the standard deviation for the data given:
{12, 13, 29, 18, 61, 35, 21}
293.67
15.87
17.14
41.98
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?
Given a variance of 64, what is the standard deviation?
8
4096
0
6.8
What is the purpose of z-scores?
to describe the exact location of a score within a distribution
to find the mean of the distribution
to describe the shape of the distribution
to find the standard deviation of the distribution
Then, 68% of all tires will have a life between ___________ km and __________ km.
In a normal distribution, what percent of the values lie within one standard deviation of the mean?
(from z = -1 to z = 1)
13.5%
34%
95%
68%
2000 freshmen at State Univ. took a Biology test. The scores were distributed normally with μ=70 and σ=5.
What percent of scores are between 65 and 75?
34%
50%
68%
81.5%
What percent of people are 3 standard deviations above the mean?
.15
34
68
2.35
What percent of people are 2 standard deviations or more above the mean?
2.35
34
68
2.5
A large sample has mean of 7.1 and Standard Error of 2.3.
Construct a 90% Confidence Interval for the population mean µ (to two decimal places).
(3.32, 10.88)
(3.8, 7.1)
(3.3, 10.9)
(3.3165, 10.8835)
An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college.
What is the point estimate?
75
105.2
10
0.90
The number of newly reported crime cases in a county in New York State is shown in the accompanying table, where x represents the number of years since 1994, and y represents number of new cases. Write the linear regression equation that represents this set of data, rounding all coefficients to the nearest hundredth. Using this equation, find the projected number of new cases for 2003, rounded to the nearest whole number.
974
25,101
940
952
