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Finding the value of percentile 90 for the given mean and third quartile Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is about normal. Find P90. (You will nee
A researcher is interested in whether social assertiveness might be influenced by training procedures. Two groups of college sophomores are randomly selected.
In a particular game a person wins $1 if they roll a 2 or a 6 on a regular cube die. The win zero (0) if they roll an off number - they win $10 if they roll a 4. What is the expected value of the ro
To find mean, standard deviation and confidence interval.Consider the following data for two independent random samples taken from two normal populations.
Mary Sue problem: Scatter Diagram, Sample Correlation Coefficient, Coefficient of determination
Draw density curves that may describe distributions with following shapes
Peanut butter problem: Calculation of Inter Quartile Range IQR. The cost of one serving of peanut butter (in cents) for a random sample of 19 jars of peanut butter was found to be.
The heights of women aged 20 to 29 are approximately normal with the mean 64 inches and standard deviation 2.7 inches. Men some age have mean height 69.3 inches with standard deviation 2.8 inches.
Black Hole Pizza Parlor instructs its cooks to put a "handful" of cheese on each large pizza. A random sample of six such handfuls was weighed.
Distribution of scores in sample: Identify the given data skewed or not. A record executive is interested in the popularity of her label's newest band, The Standard Deviations.
Find out the proportion of observation from standard normal distribution for each of following statements. In each case sketch the standard normal curve and shade area under the curve that is the an
Conduct the chi-square goodness of fit test to see if a die is balanced if, in 60 rolls, we get 8 ones, 7 twos, 12 threes, 13 fours, 7 fives, and 13 sixes.
Standard deviation calculation: To find the sample standard deviation.
Assume you were interested in whether smoking (or not smoking) was related to gender. Let's say you randomly sampled 100 subjects and found following results:
A college student is doing some research on the cost of one-bedroom apartments in town. He has randomly selected 25 apartments for which the price was published.
Estimate the mean absolute deviation based on the 2-day moving average. You can have a forecast and an actual temperature.
Consider following data set containing one hundred mileage ratings on 100 cars. Display following data in stem-and-leaf plot.
Utilize simple exponential smoothing with α = 0.3 to forecast battery sales for February through May. Suppose that the forecast for January was for 22 batteries.
Make use of simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Presume that the forecast for January was for 22 set of tires.
define MAD, MSE and MAPE for forecasting.
Utilize the sales data given below determine The MAD
The fabulous filling machine for Fruit-o Flakes cereal fills boxes of cereal according to a normal distribution with a mean of 16.0 ounces and the standard deviation of 0.2 ounces.
Score-S-Up is a company that helps students improves their test scores on college entrance exams. They advertise that the study program increases a person's score on the ACT by an average of 4 point
Four accounting majors, two economics majors, and 3 marketing majors have interviewed for 5 different positions with the large company. Find out the number of different ways that five of these could
A placement exam is given to 36 randomly chosen college students. Their mean score is 63.6 with the standard deviation of 15.1 points.