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According to some research, males have better spatial skills than do females; and according to other research, females have better reading skills than males. A student is interested in determining which sex performs better on a word-search puzzle (a puzzle in which the words are hidden vertically, horizontally, and diagonally within an array of letters) since this type of puzzle involves both spatial and reading skills. A sample of males and females volunteer to participate and are given 10 minutes to work on a 50-word puzzle. The number of words correctly recognized is recorded for each subject, and the resulting data are as follows:
Conduct the appropriate analysis of these data and determine whether there are any significant differences.
In a test of a gender-selection method, 14 babies are born and 10 of them are girls. Find the number of different possible sequences of genders that are possible when 14 babies are born
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month.
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
A mathematical placement test is given to all entering freshmen at a small college. A student who receives grades below 35 is denied admission to the regular mathematics course and placed in a remedial class.
Use the Internet or other resources to find an example of a research article in a professional journal of interest to you, and not in daily periodicals or weekly publications. Prepare a synopsis of the article including the following:
How many students must be randomly selected to estimate the mean weekly earnings of students at one college?
Assume that both samples are independant simple random samples from populations having normal distributions.
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
When I watch the weather on TV it makes me crazy that they will talk about the "average" or "normal" temperature. When they say "average" on TV weather to which of the "averages" discussed in the text are they referring?
if sample data result in a linear correlation coefficient of r 0.400 what proportion of the variation in y is
The owner of a chain of ice cream stores would like to study the effect of atmospheric temperature on sales during the summer season.
List the sample space in S and determine the number simple events. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
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