2. From a 100 sample population, the average IQ is 105 with a standard deviation of 15. A team ofscientists wants to test a new medication to see if it has either a positive or negative effect onintelligence or no effect at all.a. What is your confidence level?b. What is the z-value?c. What is the confidence interval?d. Plot in a normal distribution graph your answers

Answered: Image /qna-images/answer/44ef0c6d-8d13-4bf5-88b2-32981b8013db.jpg

Answered: 2. From a 100 sample population, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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IQ scores have a bell-shaped (mound shaped) distribution with a mean of 100 and a standard deviation of 10. Using the Empirical Rule, answer the following questions. a. What percentage of IQ scores are between 70 and 130? b. What percentage of IQ scores are less than 100? c. What percentage of IQ scores are between 90 and 110?
Given that the mean weight of senior high school students is 65kg with a standard deviation of 10kg. How many percent of students have a weight between 60 kg to 70 kg? O a. 0% O b. 38.30% C. 19.15% d. 50%
What is the normal hypothesis and alternative hypothesis?
An Excel assignment counts for 0-10 points. The scores in a class of 12 students are recorded as follows:1 5 5 6 7 7 8 8 8 9 10 10 What is the deviation of the score 10 from the mean in 13a (recall that this involves a subtraction of the mean from the particular score)? I think I got answer but want to check.
If you have a known value of 16, which of the following is the best average of your data to verify the known value? O 12.5 + 6.02 O 16 + 3.03 O 14.2 + 2.03 O 14.2 + 3.6
4. A study was conducted to investigate the relationship between the size of a house (in square feet) and the selling price of a house (in dollars). The response variable is price in dollars, and we want to study if the covariate of the square footage helps explain the response. A random sample of 522 houses was used, and the linear regression output from R is below. price sqft, data = house) 1m (formula = Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) -81432.946 11551.846 -7.049 5.74e-12 *** sqft 158.950 4.875 32.605 < 2e-16 *** Residual standard error: 79120 on 520 degrees of freedom Multiple R-squared: 0.6715, Adjusted R-squared: 0.6709
a survey, 30 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47 and standard deviation of $6. Construct a confidence interval at a 80% confidence level. Give your answers to one decimal place. H
Select all true statements below (Multiple or none can be true). With a large, representative sample, the histogram of the sample data will follow the normal curve closely. If two lists of numbers have exactly the same average of 50 and SD of 10, then the percentage of entries between 40 and 60 must be exactly the same for both lists. Half of a list of numbers is always below its average. The median and average of a list of numbers are not necessarily close together.
See the graph of data below to answer the following question Obtain a 95% confidence interval for the difference between the mean rates of return. Interpret the interval.
Answer each question and justify all work for full You will need your z and t charts for this quiz. 1. Death penalty: A group claims that the overall feelings of the general population on the . death penalty is changing. 643 people were interviewed, and of them, 258 believed in using the death penalty. Construct a 95% confidence interval for the proportion of people that believe in the death penalty. Follow the steps below: What is the best point estimate for the proportion of people who believe in the death penalty? › (round to two decimal places)
Need help with C and D please

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