What percent of items lie within 2.20 standard deviations of the mean(a) in any distribution (using the results of Chebyshev's theorem)?(b) in a normal distribution (using a table)?Click here to see page 1 of the table for areas under the standard normal curve.Click here to see page 2 of the table for areas under the standard normal curve.%.(a) The percent of items that lie within 2.20 standard deviations of the mean in any distribution is at least(Round to the nearest tenth as needed.)%.(b) The percent of items that lie within 2.20 standard deviations of the mean in a normal distribution is(Round to the nearest tenth as needed.)

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Answered: What percent of items lie within 2.20…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Suppose your manager indicates that for a normally distributed data set you are analyzing, your company wants data points between z=−1.4 and z=1.4 standard deviations of the mean (or within 1.4 standard deviations of the mean). What percent of the data points will fall in that range?Answer: ____ percent (Enter a number between 0 and 100, not 0 and 1 and round to 2 decimal places)
The per capita energy consumption level (in kilowatt- hours) in a certain country for a recent year can be approximated by a normal distribution, as shown in the figure. (a) What consumption level represents the 4th percentile? (b) What consumption level represents the 23rd percentile? (c) What consumption level represents the third quartile? The ... 317 μ=2317 kWh o=582.4 kWh G 2317 Kilowatt-hours X 4317 (a) The consumption level that represents the 4th percentile is kilowatt-hours. (Round to the nearest integer as needed.) O
Also this after the 2nd picture. (c) By hand, make a histogram and using this histogram select the correct description of the age at which women have their first child. The distribution is: (d) In which age classes do the median and quartiles fall in the ordered list of all maternal ages? Median falls within: Q1 falls within: Q3 falls within:
1. For a normal distribution, find the percent of scores that lie between the scores having z values of z = -4 and z = 6
Using the Appendix Table A-1 in Statistical Psychology: The mean for quiz#1 was 1.14, the standard deviation was .30. What proportion of the class scored above a 1.14? What proportion of the class scored below a .8? What proportion of the class scored between a 1.0 and a 1.5? What quiz grades marked off where the middle 95% of the class scored?
Which of the following statements is not true? There is only one median for each variable. One definition of the median states that, for an odd number of observations, the median is the middle score when scores are placed in order of magnitude. Another term for the median is 50th percentile. The median is generally more sensitive to (i.e., affected by) the presence of a few extreme observations than is the mean.
2. Which measures of central tendency can be used for the variable below? Explain why each of the three measures of central tendency is or is not applicable. Answer Here: How closely do you follow the news about current events? Would you say... Cumulative Frequency Percent Valid Percent Percent Valid Most of the time 1128 41.9 41.9 41.9 some of the time 1304 48.4 48.5 90.4 rarely 239 8.9 8.9 99.3 never 19 .7 .7 100.0 Total 2690 99.9 100.0 Missing Don't Know/Refused (DON'T READ) 2 .1
What percent of the standard normal z-distribution lies between the following values? (Round all answers to two decimal places.) (a) z = 0 and z = 3%(b) z = -3 and z = 0%(c) z = -3 and z = 3 (Note: This interval represents three standard deviations of the mean.)%
Withdrawal symptoms may occur when a person using a painkiller suddenly stops using it. For a special type of painkiller, withdrawal symptoms occur in 1% of the cases. A random sample of 1100 people who have stopped using the painkiller is going to be taken. Let p be the proportion of people in the sample who experience withdrawal symptoms. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of P. 0 (b) Find the standard deviation of p. 0 (c) Compute an approximation for P<0.02), which is the probability that fewer than 2% of the people in the sample experience withdrawal symptoms. Round your answer to four decimal places. 0 X

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