Unit 3: Statistics Exam Review (optional not part of..Brittany VQuestion 9 of 29 (1 point) Question Attempt: 1 of 1Español1234= 56.79.1011The distribution of scores on a standardized aptitude test is approximately normal with a mean of 520 and astandard deviation of 105. What is the minimum score needed to be in the top 15% on this test? Carry yourintermediate computations to at least four decimal places, and round your answer to the nearest integer.

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Answered: Brittany Question 9 of 29 (1 point)…

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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What is the value of the test statistics ? Round to decimal two if needed
You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = to be 95% confident that your estimate is within 5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? 54.2 dollars. You would like
CH5: For a sample with M = 62, a score of X = 51 corresponds to z = -0.34. What is the sample standard deviation? O a. 46.87 O b.97.06 )c. 57.08 O d. 64.71 e. none of the options
Homework: HW 6.2 Save 12 of 15 (2 complete) ▼ 6.2.23-T In a random sample of 10 cell phones, the mean full retail price was $525.50 and the standard deviation was $175.00. Further research suggests that the population mean is $425.96. Does the t-value for the original sample fall between – to 99 and to 99? Assume that the population of full retail prices for cell phones is normally distributed. The t-value of t = fall between – to 99 and to 99 because to 99 = - (Round to two decima d.) does not does
Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table.A biologist found the wingspans of a group of monary butterflies to be normally distributed with a mean of 52.5 mm and a standard deviation of 2.5 mm. What percent of the butterflies had the following wingspans? (Round your answers to one decimal place.) (a) less than 48.9 mm %(b) between 50 and 53 mm %
Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table.A biologist found the wingspans of a group of monary butterflies to be normally distributed with a mean of 53.4 mm and a standard deviation of 2.6 mm. What percent of the butterflies had the following wingspans? (Round your answers to one decimal place.) (a) less than 48.9 mm %(b) between 50 and 55 mm %
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miles Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 63 -. The highway patrol's policy is to issue hour miles tickets for cars with speeds exceeding 75 . The records show that exactly 2% of the speeds exceed this limit. Find the standard deviation of the speeds of hour cars travelling on California freeways. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. miles hour
6
K Assume that adults have IQ scores that are normally distributed with the top 75%. (Hint: Draw a graph.) mean of 98.9 and a standard deviation 22.5. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from The first quartile is. (Type an integer or decimal rounded to one decimal place as needed.)
Question Help Suppose you buy a new car whose advertised mileage is 20 miles per gallon (mpg). After driving your car for several months, you find that its mileage is 15.5 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.21 mpg. a. Find the z-score for the gas mileage of your car, assuming the advertised claim is correct. b. Does it appear that your car is getting unusually low gas mileage?

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