Deanna is the principal at a Midwestern middle school and wants to know the average IQ of all female, seventh grade students. She does not know anything about what the population distribution looks like. She took a simple random sample of 31 seventh-grade girls in her school and found the average IQ score in her sample was 105.8 and the standard deviation was 15. Using the sample standard deviation above to estimate the population standard deviation, what is the minimum sample size needed for a 99.5% confidence interval to have a margin of error of no more than 2.3?

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A: Sample size = n = 1500 Sample mean = m = 50,970 Sample SD = s = 12,976  The average alumni who…

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A: Given that  Sample size (n) =36 Sample mean (x¯) = 58 Sample Standard deviation (s) = 30 Confidence…

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A: In hypothesis testing, we start by stating the null hypothesis (H0) and the alternative hypothesis…

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A: n1=31,X1¯=5.5,σ1=1.4,σ2=1.1,α=0.01,n2=39

Q: test in Science and earned a 66. Use the fact that all the students' test grades ad a mean of 75.9…

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A: Note: Hi there! Thank you for posting the question. To avoid the Plagiarism issue we have used the…

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A: Test is that whether the mean weight of babies is greater than 7.2 pound. The type I error is…

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A: Let mean numbers of calls for Karen’s is µ1 and mean numbers of calls for Jodi’s is µ2.

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Q: You have collected a simple random sample of 39 students. On average (the average here is measured…

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A: The sample means are 5.2 and 4.5.

Q: Look at your height, either on your Driver's License or ID card or actually measured. Calculate the…

A:

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Q: On Bob's last history test, he had a score of 92.  Bob's z-score was -0.5, and the test's standard…

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Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: From the provided information,

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A: The objective of this question is to test the claim that there is a difference between the mean…

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A:

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A:

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: From the provided information,

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Q: Americans (on average) individually eat 16 pounds of seafood each year with a standard deviation of…

A: Given that   x̄ = 14 , μ = 16 , ? = 7 , n = 4

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Q: Lucille, Rocio, and Cristina are all taking College Mathematics but from different professors. They…

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A:

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Q: ou are a teacher at a gifted school, and you feel that the newest class of students is even brighter…

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Q: a) Calculate the z-score for Kyle's test grade. b) Calculate the z-score for Caleb's test grade. c)…

A: Formula for z score is

Q: According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the…

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Q: Mariah and Amanda began arguing about who did better on their tests, but they couldn't decide who…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.