A researcher takes a random sample of n = 10 of 5th grade students from a localschool district and determines the reading score for each. Which of the followingdistributions definitely will be normal (i.e., bell-shaped)?O The theoretical distribution of sample means will form a normal distribution.The reading scores in the sample of n = 10 students will form a normal distribution.ONeither the sample, the population, nor the distribution of sample means will definitely benormal.O The reading scores in the population (all 5th graders reading scores in the school district) willform a normal distribution

Given that A researcher takes a random sample of n = 10 of 5th grade students from a local school…

Answered: A researcher takes a random sample of n…

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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You want to find the probability of getting a z score less than or equal to 1.2. Which distribution would be the best for calculating this probablity
The scores on a standardized mathematics test for 8th-grade children in New York State form a normal distribution with a mean of m= 70 and a SD=10. a. What proportion of the students in the state have scores less than X=75? b. If samples of n=4 are selected from the population, what proportion of the samples will have means less than M=75? c. If samples of n=25 are selected from the population, what proportion of the samples will have means less than M=75?
Given the below is a bivariate distribution for the random variables x and y P(x,y) x Y 0.20 30 80 0.50 40 50 0.30 50 60 A. Draw a histogram of the probability distribution for both x and y B. Compute the covariance and correlation for x and y C. Are x and y positively related, negatively related, or unrelated Please do not solve using Microsoft Excel. My professor is not teaching using excel. I would like to see the steps taken to getting the solution for my own reference to study.
Use the Student's tt-distribution to find the tt-value for each of the given scenarios. Round tt-values to four decimal places. Find the value of tt such that the area in the right tail of the tt-distribution is 0.0005, if the sample size is 130. t= Find the value of tt such that the area in the left tail of the tt-distribution is 0.01, if the sample size is 123. t= Find the value of tt such that the area in the right tail of the tt-distribution is 0.005, if the sample size is 136. t= Find the two values of tt such that 80% of the area under the tt-distribution is centered around the mean, if the sample size is 96. Enter the solutions using a comma-separated list. t=
A professor wants to know whether or not there is a difference in comprehension of a lab assignment among students depending on if the instructions are given all in text, or if they are given primarily with visual illustrations. She randomly divides her class into two groups of 15, gives one group instructions in text and the second group instructions with visual illustrations. The following data summarizes the scores the students received on a test given after the lab. Let the populations be normally distributed with a population standard deviation of 5.32 points for both the text and visual illustrations. Text (Group 1) Visual Illustrations (Group 2) 57.3 59 45.3 57.6 87.1 72.9 61.2 83.2 43.1 64 87.3 76.7 75.2 78.2 88.2 64.4 67.5 89 86.2 72.9 67.2 88.2 54.4 43.8 93 97.1 89.2 95.1 52 84.1 Is there evidence to suggest that a difference exists in the comprehension of the lab based on the…
Which of the following is true regarding the sampling distribution of the mean for a large sample size? O It has a normal distribution with the same mean and standard deviation as the population. O It has the same shape, mean, and standard deviation as the population. O It has the same shape and mean as the population, but has a smaller standard deviation. O It has a normal distribution with the same mean as the population but with a smaller standard deviation.
Aleks spins a 9 sided spinner 56 times. Each of the nine sides has a different colour on it. He records the number of times that he spins the colour purple. Is it reasonable to approximate this distribution with a normal distribution? Give a reason.
Each of the boxplots shown summarizes 24 student scores on a recent test in two different classes. The boxplots are drawn using a common numerical scale. Which of the following must be true? 1. The lower 25% of Class B are much more spread out than the lower 25% of Class A 2. More people scored below the lower quartile for Class A than Class B 3. The distribution for Class B is skewed left and has a noticeable outlier as well, while the distribution for Class A is somewhat skewed right 4.Class A had more people between the median and the lower quartile than Class B. 3.The distribution for Class A is somewhat symmetric, while the distribution for Class B is skewed right with a noticeable outlier as well
Use the Student's tt-distribution to find the tt-value for each of the given scenarios. Round tt-values to four decimal places. Find the value of tt such that the area in the left tail of the tt-distribution is 0.0005, if the sample size is 73. t= Find the value of tt such that the area in the right tail of the tt-distribution is 0.01, if the sample size is 76. t= Find the value of tt such that the area in the left tail of the tt-distribution is 0.05, if the sample size is 74. t= Find the two values of tt such that 95% of the area under the tt-distribution is centered around the mean, if the sample size is 32. Enter the solutions using a comma-separated list. t=
Which of the following distributions would be most likely to have a tail, and why? A. The GPAs of NMSU students, because some students have a 4.0. B. Class scores on a quiz, with 10 points possible, because the most common scores are 7, 8, and 9. C. The time it takes to install a new piece of computer software, because usually it’s quick, but occasionally it takes hours or even days. D. The amount of money you spend each month on food, because food prices change a little from day to day, and sometimes things are on sale.
Part d, e and f please
answer d)

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