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Justin Ray

Justin R.

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What's Wrong? Heights of adult males are known to have a normal distribution, as described in this section. A researcher claims to have randomly selected adult males and measured their heights with the resulting relative frequency distribution as shown here. Identify two major flaws with these results.

What's Wrong? Heights of adult males are known to have a normal distribution, as described in this section. A researcher claims to have randomly selected adult males and measured their heights with the resulting relative frequency distribution as shown here. Identify two major flaws with these results.

Elementary Statistics

Exploring Data with Tables and Graphs

Frequency Distributions for Organizingā€¦
Which normal distribution has a wider spread: the one with mean 1 and standard deviation 2 or the one with mean 2 and standard deviation 1? Explain your answer.

Which normal distribution has a wider spread: the one with mean 1 and standard deviation 2 or the one with mean 2 and standard deviation 1? Explain your answer.

Introductory Statistics

The Normal Distribution

Introducing Normally Distributedā€¦

Questions asked

ANSWERED

Kari Hasz verified

Numerade educator

Find the area between z-scores -0.55 and 1.2 in the standard normal distribution.

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ANSWERED

Paul A. verified

Numerade educator

The test statistic of z=2.66 is obtained when testing the claim that pā‰ 0.303. a. Identify the hypothesis test as being two-tailed, left-tailed, or right-tailed. b. Find the P-value. c. Using a significance level of Ī±=0.05, should we reject H0 or should we fail to reject H0?

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ANSWERED

Qudsiya Anis verified

Numerade educator

Use the accompanying 200 Los Angeles commute times to test the claim that the mean Los Angeles commute time is less than 31 minutes. Assume that a simple random sample has been selected. Use a 0.05 significance level. Compare the sample mean to the claimed mean of 31 minutes. Is the difference between those two values statistically significant? Identify the null and alternative hypotheses. H0: ? H1: ? (Type integers or decimals. Do not round.) Identify the test statistic. ? (Round to two decimal places as needed.) Part 3 Identify the P-value. ? (Round to three decimal places as needed.) Commute Times 30 30 30 60 13 45 35 20 15 30 30 45 45 1 20 20 40 60 25 10 35 45 25 10 30 10 15 30 10 28 30 10 30 10 28 15 30 35 45 20 15 20 15 60 50 15 20 20 15 15 15 30 10 60 20 15 20 10 30 60 15 30 60 60 60 5 55 10 25 60 20 40 20 30 60 40 15 90 60 30 60 30 5 33 5 15 30 45 30 30 30 75 10 10 30 15 1 60 15 15 10 17 30 15 35 40 15 15 50 12 25 25 30 10 45 15 45 10 30 30 30 45 10 30 30 20 50 15 15 20 25 45 13 40 20 45 15 15 50 25 60 20 60 30 25 25 141 30 18 35 25 60 20 40 15 16 25 30 15 15 10 45 15 10 5 15 60 30 20 20 25 15 42 20 45 40 60 15 20 5 40 20 45 20 25 55 15 20 12 10 48 5 25 45 30 90 30 25 20 30

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Jerelyn Nevil verified

Numerade educator

Systolic blood pressure levels above 120 mm Hg are considered to be high. For the 100 systolic blood pressure levels listed in the accompanying data set, the mean is 123.54000 mm Hg and the standard deviation is 14.82246 mm Hg. Assume that a simple random sample has been selected. Use a 0.05 significance level to test the claim that the sample is from a population with a mean greater than 120 mm Hg. Body and exam measurements are from 100 subjects. SYSTOLIC is systolic blood pressure (mm Hg). 112 112 116 104 126 130 114 126 130 114 122 132 106 112 134 114 128 132 114 118 124 128 132 154 116 122 130 102 110 142 120 134 136 128 134 140 94 112 140 114 120 144 100 136 156 108 112 112 120 142 146 108 132 164 120 126 136 96 112 142 92 114 122 104 124 128 126 128 134 102 108 120 116 128 138 112 120 160 132 134 146 102 132 154 112 114 132 100 116 138 106 124 136 114 122 144 116 118 136 110

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INSTANT ANSWER

Suppose that in a random selection of coloredā€‹ candies, ā€‹% of them are blue. The candy company claims that the percentage of blue candies is equal to ā€‹%. Use a significance level to test that claim.

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ANSWERED

Sheryl Ezze verified

Numerade educator

Science fiction novels average 240 pages in length. The average length of 14 randomly chosen novels written by I. M. Wordy was 280 pages in length with a standard deviation of 40. Are Wordy's novels significantly longer than the average? Assume = .05. What is the test value, the critical value(s), and the conclusion?

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ANSWERED

Robin Corrigan verified

Numerade educator

Express the confidence interval (0.017,0.085) in the form of pāˆ’E < p < p+E. type as integer or as decimals

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ANSWERED

Hoan Nguyen verified

Numerade educator

A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=1025 and x=517 who said "yes." Use a 95% confidence level. What is the best point estimate of the population proportion p? What is the margin of error?

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