1.) I want to estimate the proportion of adults who like sci-fi movies. How many people should I poll to be 96% confident that I am within 1% of the population proportion? 2.) High school seniors' SAT scores are normally distributed with µ = 1050 and o = 100. If a student is selected at random, find the probability that her SAT score is: a.) above 1200 b.) below 890 %3D c.) between 1000 and 1100 d.) What SAT score separates the smartest 4% of students? e.) If 18 seniors are selected, find the probability that their mean SAT score is above 1150 3.) A survey of 200 college students revealed that 160 of them eat dessert daily. Construct a 95% confidence interval for the population proportion of college students who eat dessert daily. 4.) I want to estimate the mean number of minutes that a 7-year-old watches TV daily. How many kids should I poll in order to be 99% confident that I am within 15 minutes of the actual time? Assume o = 45 min. 5.) The following are wait times (in minutes) at a certain DMV: 25 76 56 45 35 88 75 66 45 77 65 66 43 65 a.) Construct a 95% confidence interval for the mean wait time at this DMV. b.) Construct a 90% confidence interval for the standard deviation of wait times
1.) I want to estimate the proportion of adults who like sci-fi movies. How many people should I poll to be 96% confident that I am within 1% of the population proportion? 2.) High school seniors' SAT scores are normally distributed with µ = 1050 and o = 100. If a student is selected at random, find the probability that her SAT score is: a.) above 1200 b.) below 890 %3D c.) between 1000 and 1100 d.) What SAT score separates the smartest 4% of students? e.) If 18 seniors are selected, find the probability that their mean SAT score is above 1150 3.) A survey of 200 college students revealed that 160 of them eat dessert daily. Construct a 95% confidence interval for the population proportion of college students who eat dessert daily. 4.) I want to estimate the mean number of minutes that a 7-year-old watches TV daily. How many kids should I poll in order to be 99% confident that I am within 15 minutes of the actual time? Assume o = 45 min. 5.) The following are wait times (in minutes) at a certain DMV: 25 76 56 45 35 88 75 66 45 77 65 66 43 65 a.) Construct a 95% confidence interval for the mean wait time at this DMV. b.) Construct a 90% confidence interval for the standard deviation of wait times
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
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Transcribed Image Text:1.) I want to estimate the proportion of adults who like sci-fi movies. How many people
should I poll to be 96% confident that I am within 1% of the population proportion?
2.) High school seniors' SAT scores are normally distributed with µ = 1050 and o = 100.
If a student is selected at random, find the probability that her SAT score is:
a.) above 1200 b.) below 890
%3D
c.) between 1000 and 1100 d.) What SAT
score separates the smartest 4% of students?
e.) If 18 seniors are selected, find the probability that their mean SAT score is above
1150
3.) A survey of 200 college students revealed that 160 of them eat dessert daily.
Construct a 95% confidence interval for the population proportion of college students who
eat dessert daily.
4.) I want to estimate the mean number of minutes that a 7-year-old watches TV daily.
How many kids should I poll in order to be 99% confident that I am within 15 minutes of the
actual time? Assume o = 45 min.
5.) The following are wait times (in minutes) at a certain DMV:
25
76
56
45
35
88
75
66 45
77 65
66
43
65
a.) Construct a 95% confidence interval for the mean wait time at this DMV.
b.) Construct a 90% confidence interval for the standard deviation of wait times
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