Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 10. Use the empirical rule to determine the following.(a) What percentage of people has an IQ score between 70 and 130?(b) What percentage of people has an IQ score less than 80 or greater than 120?(c) What percentage of people has an IQ score greater than 110?ar(a) % (Type an integer or a decimal.)ra

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Claim: Fewer than 92% of adults have a cell phone. In a reputable poll of 1178 adults, 87% said that they have a cell phone. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.)
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Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. A recent survey found that 281 of 800 parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. Do parents feel differently today than they did twenty years ago? Use the a=0.1 level of significance. *** Because npo (1-Po) = 199.7 less than 5% of the population size, and the sample can be reasonably assumed to be random, the 10, the sample size is requirements for testing the hypothesis are satisfied. (Round to one decimal place as needed.) D What are the null and alternative hypotheses? Ho versus H₁ (Type integers or decimals. Do not round.) Help me solve this View an example Clear all Check answer Type here to search O 1:12 PM 6/18/2022 3 1 7 Q 2 @ 7 S E C $ 4 R 06 5 T S B 6 Get more help - 18 H & N 8 M hp K a O a P 12 (?) prt sc 94°F Mostly…
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The numbers of students in the 10 schools in a district are given below. (Note that these are already ordered from least to greatest.) 204, 250, 255, 262, 274, 311, 369, 381, 389, 415 Send data to calculator Suppose that the number 204 from this list changes to 304. Answer the following. (a) What happens to the mean? It decreases by U O It increases by O It stays the same. (b) What happens to the median? O It decreases by O It increases by O It stays the same.
Claim: Fewer than 91% of adults have a cell phone. In a reputable poll of 1045 adults, 82% said that they have a cell phone. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.)
(a) What is the class width? |(Type a whole number.) (b) Approximately 10% of students had a composite score below what level? ||(Type a whole number.) (c) What percentage of students had a composite score less than 30? % (Type a whole number.) (d) Ten percent of students had a composite score above what level? (Type a whole number.)
Suppose there are 5 students in a room. The mean age is 19.8 years, and the median age is 19. If the youngest person leaves and is not replaced by another person, what happens to the mean and the median? O The mean and median increase. The mean increases, and the median either increases or stays the same. The mean increases, but it is impossible to determine whether the median increases, decreases, or stays the same. The mean increases, and the median stays the same. The median increases, and the mean either increases or stays the same.
A polling company reported that 37% of 1018 surveyed adults said that rising gas prices are "very harmful." Complete parts (a) through (d) below. a. What is the exact value that is 37% of 1018? The exact value is. (Type an integer or a decimal.) b. Could the result from part (a) be the actual number of adults who said that rising gas prices are "very harmful"? Why or why not? O A. No, the result from part (a) could not be the actual number of adults who said that rising gas prices are "very harmful" because that is a very rare opinion. O B. No, the result from part (a) could not be the actual number of adults who said that rising gas prices are "very harmful" because a count of people must result in a whole number. O C. Yes, the result from part (a) could be the actual number of adults who said that rising gas prices are "very harmful" because the results are statistically significant. D. Yes, the result from part (a) could be the actual number of adults who said that rising gas prices…
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(a) What percentage of people has an IQ score between 70 and 130? (b) What percentage of people has an IQ score less than 80 or greater than 120? (c) What percentage of people has an IQ score greater than 110?