Buying textbooks for a year at college can be expensive! An article claimed that, on average, college studentsspend approximately $500 on textbooks per year with a standard deviation of $325 and the interquartile range(IQR) is $180. The dotplot shows the results of taking 50 SRSS of size 10 from a Normal population with = 500and = 325 and recording the sample IQR each time.60 80 100 120 140 160 180 200 220 240 260 280IQR = Simulated sample interquartile range of theannual cost of college textbooks ($)(a) Briefly explain what the dot at 240 represents.(b) Suppose a random sample of 10 actual college students was selected and the IQR of this actual sample isIQR = $90. What would you conclude about the claim that the population IQR is $180?

When drawing a dot plot, we divides the values in dataset into many intervals called bins. The…

Answered: Buying textbooks for a year at college…

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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QUESTION 22 Use the 68-95-99.7 rule to solve the problem. The amount of Jen's monthly phone bill is normally distributed with a mean of $56 and a standard deviation of $12. Fill in the blanks. and $__. 68% of her phone bills are between $ 32, 56 56, 68 32, 80 44, 68 0000
QUESTION 6 The Corner Drug Store fills prescriptions for a popular children's antibiotic, amoxicillin. The daily demand for amoxicillin is normally distributed, with a mean of 200 kilograms and a standard deviation of 80 kilograms. The vendor for the pharmaceutical firm that supplies the drug calls the drugstore pharmacist every 30 days to check the inventory of amoxicillin. During a call, the druggist indicated that the store had 60 kilograms of the antibiotic in stock. The lead time to receive an order is 4 days. a) Determine the order size that will enable the drugstore to maintain a 95% service level.
Question: A research study claims that the average height of adult men in a certain city is 68 inches. A random sample of 25 men is taken and their average height is found to be 66 inches with a standard deviation of 2 inches. Can we reject the claim at a 0.01 level of significance?
Part C
The ability to determine the age of some individuals can be difficult if there are not quality government records of birth. Bone growth takes place at the growth plates at the end of long bones. Once all growth plates fuse, growth stops, and an individual is considered a biological adult. The age at which growth plates fuse for males is approximately normally distributed with a mean of 19 years and a standard deviation of 15.1 months. Complete parts (a) through (d). e this (a) What is the probability a male's growth plates fuse after age 21? The probability a male's growth plates fuse after age 21 is (Round to four decimal places as needed.) View an example Get more help. 4 CE 4 PrtScn Home End F10 PgUp Clear all ^O S ↓ PgDn Check answer 12:55 PM 11/21/2022
QUESTION 17 The amount of time a bank teller spends with each customer has a population mean of 3 minutes and a standard deviation of 0.40 minute. A random sample of 64 customers is selected. There is a 95% chance that the sample mean is less than how many minutes? Round your answer to three decimal places. QUESTION 18 An automotive repair shop has determined that the service time on an automobile is normally distributed with a mean of 100 minutes and a standard deviation of 15 minutes. What is the probability that a random sample of 9 automotive services will have a mean service time greater than 115 minutes? Round your answer to four decimal places. QUESTION 19 Salaries of computer engineers in UAE are strongly right skewed with mean AED 34000 and standard deviation AED 4500. A random sample of 9 computer engineers is taken. What is the probability that the average salary of the sample is more than AED 32000? 0.9088 0.0912 Not enough information 0.1545
Question 5 The average amount of time boys and girls of ages 7 through 11 spend playing sports each day is believed to be the same. An experiment is done and data is collected, resulting in the table below. Assume that the populations follow a normal distribution with equal variances. Is there a difference in the mean amount of time boys and girls spend playing sports each day? Test at 5% level of significance. Girl Boys Sample size Average number of hours playing Sample standard deviation sports per day 2 hours 0.75 3.2 hours 9 16
Question H The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 1261 chips and a standard deviation of 118 chips. (a) Determine the 28th percentile for the number of chocolate chips in a bag. (b) Determine the number of chocolate chips in a bag that make up the middle 96% of bags. (c) What is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies? (a) The 28th percentile for the number of chocolate chips in a bag of chocolate chip cookies is (Round to the nearest whole number as needed.) chocolate chips. (b) The number of chocolate chips in a bag that make up the middle 96% of bags is | (Round to the nearest whole number as needed. Use ascending order.) chocolate chips. to (c) The interquartile range of the number of chocolate chips is (Round to the nearest whole number as needed.) Enter your answer in each of the answer boxes. 11:59pm thase Options A0.50LA Type here to search
Question 5 The mean age when smokers first start is 13 years old with a population standard deviation of 1.9 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 35 smokers found that their mean starting age was 12.4 years old. Do the data support the claim at the 5% significance level? What are the correct hypotheses? Ho: Select an answer Critical Values = + Submit Question H₁: Select an answer ✓ ? ✓ Based on the hypotheses, find the following: Test Statistic z = years years (Give answer to at least 4 decimal places) (Give answer to at least 4 decimal places) Based on the above we choose to Select an answer The correct summary would be: [Select an answer mean age smokers first start is different than 13. that the claim that the
Question: A study claims that the average amount of caffeine consumed by college students in a day is 200 milligrams. A sample of 50 students is taken, and their average caffeine consumption is found to be 210 milligrams with a standard deviation of 20 milligrams. Can we reject the claim at a 0.05 level of significance?
QUESTION 3 A survey of 31 men found that an average amount spent on St. Patrick's day of $104 with a standard deviation of $28. A similar survey of 52 women found they spent an average of $55 with a standard deviation of $12. When testing the hypothesis (at the 5% level of significance) that the variance that men spend more than the variance of what women spend on St. Patrick's day, what is the test statistic? (please round your answer to 2 decimal places)
QUESTION 27 Glucose levels in patients free of diabetes are assumed to follow a normal distribution with a mean of 120 and a standard deviation of 16. What proportion of patients have glucose levels exceeding 115?

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