Question 1The marks of 7 math students were recorded. Find the sample standard deviation.61, 64, 65, 72, 78, 81, 86(x - x)²Step 1) Find the sample meanX =Step 2) Make a table and calculate (x-x)²Step 3) Add up all the values you just found.Step 4) Plug this into the standard deviation formula.MathMark (x)Σ(x-x)² =

Answered: The marks of 7 math students were…

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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Example For 100 observations, the arithmetic mean and standard deviation are 8 and V10.5 · For 50 observations selected from these 100 observations, the mean and standard deviation are 10 and 2 respectively. Find the mean and standard deviation of the other half.
= 3 10 Withdrawal symptoms may occur when a person using a painkiller suddenly stops using it. For a special type of painkiller, withdrawal symptoms occur in 2% of the cases, Consider a random sample of 1600 people who have stopped using the painkiller. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p is the proportion of people in the sample who experience withdrawal symptoms. (b) Find the standard deviation of p. (c) Compute an approximation for P(p <0.01), which is the probability that fewer than 1% of those sampled experience withdrawal symptoms. Round your answer to four decimal places.
The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range, mean, variance, and standard deviation of the sample data set. 12, 19, 23, 14, 16, 16, 22, 16, 15, 19 The range is (Simplify your answer.) The mean is (Simplify your answer. Round to the nearest tenth as needed.) The variance is (Simplify your answer. Round to the nearest tenth as needed.) The standard deviation is (Simplify your answer. Round to the nearest tenth as needed.)
A deviation score is the difference between the score and the __________.
Temperature in degrees Fahrenheit has been collected from a sample of 50 individuals. The mean is 98.5 and standard deviation is 3.2. If we convert each observation into degrees in the centigrade scale ((X°C × 9/5) + 32 = Y°F) then what would be the new mean and standard deviation of the set of temperatures?
Solve Part a Suppose X is a normally distributed variable with a mean of 10 and a deviation of 2. Please give a numerical solution for part (a) a. Find p(X<0)
The coefficient of variation CV describes the standard deviation as a percent of the mean. Because it has no units, you can use the coefficient of variation to compare data with different units. Find the coefficient of variation for each sample data set. What can you conclude? Standard deviation CV = • 100% Mean E Click the icon to view the data sets. Data Table C/heights = 5.0 % (Round to the nearest tenth as needed.) Heights Weights CVweights =% (Round to the nearest tenth as needed.) 68 181 77 169 72 167 72 207 71 177 70 175 78 185 69 186 67 221 70 216 67 209 73 206
4 n ex You used SS = x (x-x)² when calculating variance and standard deviation. An alternative formula for the standard deviation that is sometimes convenient for hand calculations is shown below. You can find the sample variance by dividing the sum of squares by n-1, and the sample standard deviation by finding the square root of the sample variance. Complete parts (a) and (b) below. (Ex)² SS = Ex². Click the icon for a table of the ages (in years) of shoppers at a local store. Data table 19 16 15 18 20 17 19 16 Shoppers' Ages 20 20 18 18 20 19 24 20 18 18 16 16 n X ar all Check answer
Water Temperature If the variance of the water temperature in a lake is 28°, how many days should the researcher select to measure the temperature to estimate the true mean within 3° with 90% confidence? Round the intermediate calculations to two decimal places and round up your final answer to the next whole number. The researcher needs a sample of at least days.
Assume that the readings on the thermometers are normally distributed with a mean of 0° and standard deviation of 1.00°C. A thermometer is randomly selected and tested. Draw a sketch and find the temperature reading corresponding to P34, the 84th percentile. This is the temperature reading separating the bottom 84% from the top 16%. Click to view page 1 of the table. Click to view page 2 of the table. Which graph represents P ? Choose the correct graph below. 84 A. В. OC. D. Ay X The temperature for P84 is approximately (Round to two decimal places as needed.)
Plz help asap 28
Calculate the mean, variance, and standard deviation of following "Population" data: 96,65,64,95, and 95. Round to two decimal places as needed Click this video to learn more about the formula 96 65 64 95 95 X x-μ (x-μ)² THE C Mean Variance Standard Deviation

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