Simple random sampling uses a sample of size n from a population of size N to obtain data that can be used to make inferencesabout the characteristics of a population. Suppose that, from a population of 40 bank accounts, we want to take a random sample ofseven accounts in order to learn about the population. How many different random samples of seven accounts are possible?

Here population size N = 40 Sample size n = 7

Answered: n. How many different random samples of…

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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Suppose that Mairin has knit a collection of wool‑blend infinity scarves that she wants to sell in her Etsy shop for $28.00 each. However, she is worried that if the average price of comparable scarves is less than $28.00, hers would be less likely to sell. Mairin selected a random sample of 9 similar hand‑knit, wool‑blend infinity scarves, and their prices are as follows. $21.75,$24.00,$27.25,$29.95,$23.00,$26.00,$27.80,$33.50,$27.00$21.75,$24.00,$27.25,$29.95,$23.00,$26.00,$27.80,$33.50,$27.00 Use a left‑tailed one‑sample ?t‑test to determine whether the average price of hand‑knit, wool‑blend infinity scarves sold on Etsy is less than $28.00. Assume that the prices of all comparable scarves are normally distributed. Mairin should (reject, accept, fail to accept) her null hypothesis. There is (sufficient, no, insufficient) evidence that the mean price of hand‑knit, wool‑blend infinity scarves is (greater than, different from, less than, equal two) $28.00.
. There are 20290 protein coding genes in the human genome. The total length of all 22 autosomal chromosomes plus the two sex chromosomes is 1052 mm. The length of the X chromosome is 53 mm. We assume that the size of protein coding genes is equal among chromosomes. We're interested in testing whether the number of protein coding genes is evenly distributed among chromosomes including the sex chromosomes. Calculate the EXPECTED number of protein coding genes on the X chromosome.
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1- 6. A coach is interested in how many slam dunks the average college freshmen athis university can do. Ten volunteers from the senior class step forward. After observing their performance, the coach concludes that college seniors can do an average of 10 slam dunks in a row without missing What is the sample? What is the population?
A group of students at a local university were asked about their status (undergraduate, graduate, or non-degree seeking) and how they get to campus (walk/bike or car/bus/etc.). The results are summarized in the table below. How do you get to Campus? Walk/Bike Car/Bus/etc. Total Undergraduate 80 20 100 Graduate 40 10 50 Non-degree Seeking 10 40 50 Total 130 70 200 Suppose we choose a person at random from this sample. Which of the following statements is true? (A) If the person uses a car/bus/etc. to get to campus, then he or she is more likely to be a non- degree seeking student than a degree seeking student (undergraduate or graduate). (B) If the person is an undergraduate, then he or she is more likely to use a car/bus/etc. to get to campus than to walk/bike to campus. (C) The person is more likely be a graduate student if he or she uses a car/bus/etc. to get to campus than if he or she walks/bikes to campus. (D) The person is more likely to use a car/bus/etc. to get to campus than…
Which one of the following is an advantage of simple random sampling a. Cost effective b. Guarantees an accurate representation of the population. c. Quick d. All elements have an equal chance of being selected
10
Below are the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status. If a patient is selected at random: What proportion of normal weight patients are not diabetic? What proportion of patients are normal weight or underweight? Underweight Normal Weight Overweight Obese Row Totals Diabetic 8 34 65 43 150 Not Diabetic 12 85 93 40 230 Column Totals 20 119 158 83 380
a) Market research has shown that 60% of persons who are introduced to a certain product actually buy the product. A random sample of 15 persons were introduced to the product.
10) Last school year, the student body of a local university consisted of 35% freshmen, 24% sophomores, 26% juniors, and 15% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification. Freshmen 90 Sophomores 60 Juniors 90 Seniors 60 We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. The expected frequency of seniors is a. 45 b. 35 c. 65 d. 55
According to a report, 57.8% of murders are committed with a firearm. (a) If 300 murders are randomly selected, how many would we expect to be committed with a firearm? (b) Would it be unusual to observe 182 murders by firearm in a random sample of 300 murders? Why?
The sexes and ages of a random sample of 300 runners taking part in marathons are classified as follows in the table below. Table: Sexes and ages of runners taking part in marathons. Sex Observed Row totals Male emale Under 40 70 54 124 Age group 40-49 76 36 112 50 and over 52 12 64 Column totals 198 102 300 What is the expected frequency of a female runner between the ages 40-49?

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