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Construct a 95% confidence interval for the population mean, based on the following sample size of n=5. 1,2,3,4, and 25. Then change the number 25 to 5 and recalculate the confidence interval.
In a one way ANOVA, the degrees of freedom for the rows is 6, for the columns it is 10, and for error it is 8. How many total degrees of freedom are there in this construction?
The average tread wear was found to be 50,000 miles with a standard deviation of 3,500 miles. What is the best estimate of the average tread life in miles for the entire population of these tires
Let three fair coins be tossed. Let A= ( all heads of all tails), B= ( at least two heads), and C= ( at most two tails). List the sample points in A,B,C respectively.
They will be president, vice president, and, secretary. How many different ways are there to select these three students.
Suppose a population has mean µ = 100 and the population standard deviation s = 25. Also, suppose a random sample of size n = 36 is selected and the sample mean (X-bar) = 90. Does this sample
Define the terms parameter and statistic, Be sure that the concepts of population and sample are included in the definition.
According to the empirical rule, if the data form a "bell-shaped" normal distribution, ________ percent of the observation will be contained within 1 (one) standard deviation around the arithmetic m
Suppose Xis a random variable with mean -5 and variance 2. What can you say about the probability that X deviates from its mean by at least 4?
Four scales of measurement were introduced in the chapter: nominal, ordinal, interval, and ratio. What additional information is obtained from measurements on a ratio scale compared to measurements
Suppose the evaluation model showed that for a particular restaurant the resource mix necessary to produce a given output mix was 90% of what another restaurant was using to produce that same mix of
How often do you have to toss a coin to determine P(heads) within .1 of its true value with probability at least .9?
Find the z-score corresponding to a score of X = 100 for each of the following distributions. Make sure to indicate the direction (sign) of the z-scores.
Explain what these measure. Are they the same as forecast accuracy measures? Why or why not.
The 2 largest challenges we face in applying a decomposition model is understanding the components and how it will affect our forecast. We typically see the largest enrollment numbers in the fall d
If being female is independent of being left-handed, what proportion of the population consists of left-handed females?
Part of our daily activities is to forecast our expected enrollments each day, week and quarter. We in admissions can base our forecasts off of various components to determine accurate numbers.
Write a brief description of a real-world example in which one measure of central tendency provides useful information while another measure of central tendency provides meaningless (or even mislea
The amount of gasoline sold daily at a service station is a value of x of a random variable. Determine the probability that daily sales will fall between 2500 and 3000 gallons.
Even though my organization has a tough time separating the target/goal definition with the forecast definition; the method of forecasting we use is time series.
How would you, as a researcher and public health professional, convince someone who is skeptical about research results obtained from a sample, that data are reliable and an accurate representation
Suppose that X is a continuous random variable with a probability distribution f(x) = (2x)/25 where x is between 0 and 5 (inclusive). Now let Y = 3x + 5 and domain be 5 ≤ y ≤ 20. Find:
Identify the circumstances in which the median rather than the mean is the preferred measure of central tendency.
Assume that the probability a child is a boy is 0.51 and that every child's sex, born into a family, is independent. What is probability that a family of 5 children has exactly 3 boys.
The following data are results from a study you recently completed. Calculate the correlation coefficient for this data. (Show work or use excel print out)