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Suppose we have a population of scores with a mean (µ) of 975 and a standard deviation (s) of 15. Assume that the distribution is normal. Provide answers to the following questions:
What percentage of the population will lie between 960 and 990?
An automobile assembly line operation has a scheduled mean completion time,u , of 12.6 minutes. The standard deviation of completion times is 1.8 minutes.
The prices recorded were $1.36, $1.37, $1.38, $1.39, and $1.40. What is the range, mean price, and the standard deviation of the gasoline?
If a researcher decides to use multiple comparisons in a study with three conditions, what is the probability of a Type I error across these comparisons? Use the Bonferroni adjustment to determine the suggested alpha level.
For a lottery to be successful, the public must have con dence in its fairness. One of the lotteries in Maryland is Pick-3 Lottery. Write down the test statistic to be used for testing the hypothesis.
A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
Create one table that calculates summary measures of the change in test scores and income variables across all 80 schools.
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
Assume that the length X in minutes of a regular season NBA game is normally Distributed with X~N (µ X , σ 2 X );
Predict the number of accidents per year (to the nearest whole number) for a person whose age is 45 and who works 42 hours per week.
A regression of attitude toward legalizing marijuana on age (X1) and education (X2) produced the following estimated coefficients and standard errors for a sample of 265 persons.
Write three quadratic equations, with a, b, and c (coefficients of x2, x, and the constant) as:
Perform Repeated Measures ANOVA also calculate PRE. An educational study uses a simple pre-post design to assess the value of a computer tutor for solving inequalities.
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