A test is given to a sample of 20 students and the test score are recorded as 62, 50, ..., 67. Suppose 62^2+ 50^2+... +67^2 = 288,000 and the average test score is 70. The sample standard deviation is closest to ...

A test is given to a sample of 20 students and the test score are recorded as 62, 50, ..., 67. Suppose 62^2+ 50^2+... +67^2 = 288,000 and the average test score is 70. The sample standard deviation is closest to ...

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Suppose we are comparing the ages of undergraduate students in two statistics classes at two different universities, A and B. The standard deviation of the ages of undergraduate students at university A is 5 years, while the standard deviation of the ages of undergraduate students at university B is 1 year. What statement below is true about the ages of these students when considering standard deviations? (a) The ages of students at university A are less spread out than the ages of students at university B. (b) The ages of students at university A are more spread out than the ages of students at university B. ( c) Students at university A are younger than students at university B. (d) Students at university A are older than students at university B.
To become an actuary, it is necessary to pass a series of 10 exams, including the most important one, an exam in probability and statistics. An insurance company wants to estimate the mean score on this exam for actuarial students who have enrolled in a special study program. They take a sample of 8 actuarial students in this program and find the mean of the sample is 6.0 with standard deviation of the sample 2.0. This sample will be used to calculate a 95% confidence interval for the mean score for actuarial students in the special study program. A 95% confidence interval for the mean score of actuarial students in the special program is from ________ to ________. Question 17 options: 1) 3.52 to 8.47 2) 4.69 to 7.31 3) 4.66 to 7.34 4) 4.33 to 7.67
A student gets marks in 10 subjects as 38, 70, 48, 34, 42, 55, 63, 46, 54 and 44. The mean deviation about mean is - (a)6.6 (b)7.6 (c)8.6 (d)10.6
In a distribution of the test grades with the mean of 25 and the standard deviation of 4, what would be the z-score of grade 32? Round to 2 decimals.
The scores in a test conducted to 500 students are normally distributed with a mean of 110 and a standard deviation of 6. How may students get a score below 102?
Suppose a test is given to 20 randomly selected college freshmen in Ohio. The sample average score on the test is 12 points and the sample standard deviation is 4 points. Suppose the same test is given to 16 randomly selected college freshmen in Iowa. The sample average score on the test is 8 points and the sample standard deviation is 3 points. We want to test whether there is a significant difference in scores of college freshmen in Ohio versus Iowa. What is the point estimate for the difference in population means, where difference is defined as (Ohio minus Iowa)?
What proportion of the distribution of sample means is between a z of 1.34 and z of -1.00?
A recent study was conducted and it found that IQ's are normally distributed with a mean of a 100 and a standard deviation of 15. 1. What is the probability that a randomly selected individual would have an IQ between 97 and 112 2. What is the probability that a randomly selected individual would have an IQ between 100 and 113 3. What is the probability that a randomly selected individual would have an IQ of less than 112 and greater than 115
suppose the profit a Honda dealership makes on the next 5 Accords it sells are:545, 991, 902, 1,480, 1,383. Calculate the standard deviation of the sample. (please express your answer using 2 decimal places)
can you find the mean and standard deviation?
The distribution of sample means for bi-monthly employee income at a particular company for samples of 70 employees is normal with a mean of $5921 and a standard deviation of $219. You take a random sample of 70 employees from the company and find that their mean bi-monthly income is $5668. How many standard deviations is the sample mean from the mean of the distribution of sample means?
Let's say that the mean score on this exam turns out to be 73 with a standard deviation of 12 and is normally distributed. If I gave a B to everyone who had an 80 or above, what percent of the class would get B's (or better)?