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Female undergraduates in randomized groups of 17 took part in a self-esteem study. The study measured an index of self-esteem from the point of view of competence, social acceptance, and physical attractiveness. Let x1, x2, and x3 be random variables representing the measure of self-esteem through x1 (competence), x2 (social acceptance), and x3 (attractiveness). Higher index values mean a more positive influence on self-esteem. Variable Sample Size Mean x Standard Deviation s Population Mean x1 17 20.25 3.34 ?1 x2 17 20.46 3.84 ?2 x3 17 17.00 3.25 ?3 (a) Find a 99% confidence interval for ?1 - ?2. (Use 2 decimal places.) lower limit ? upper limit ? (b) Find a 99% confidence interval for ?1 - ?3. (Use 2 decimal places.) lower limit ? upper limit ? (c) Find a 99% confidence interval for ?2 - ?3. (Use 2 decimal places.) lower limit ? upper limit ? (d) Comment on the meaning of each of the confidence intervals found in parts (a), (b), and (c). At the 99% confidence level, what can you say about the average differences in influence on self-esteem between competence and social acceptance? between competence and attractiveness? between social acceptance and attractiveness?
a psychologist is conducting a study in which 30 students attend workshops by the speaking center for one hour per
consider the following regression modelsalaryin 1000 20 2x 5z 0.7xzwhere x is the number of years of experience
To find the necessary sample size to achieve the given level of accuracy of prediction.
a regression line was calculated as y 42.5 3.1 x. what is the predicted value of y when x 2.5
build a linear model by using y as the outcome variable and x1 and x2 as the predicting variables. make sure to write
q1 the average age of ceos is 56 years. assume the variable is normally distributed. if the standard deviation
If the class does well on an exam, then the next exam is equally likely to be any of the three types. If the class does badly, then the next exam is always type 1. What proportion of exams are type 1, 2, and 3?
Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones. What is the probability the first two electric toothbrushes sold will be defective.
If you had a research problem appropriate for ANOVA and it was based on the results from three samples, what would be the null hypothesis?
Determine the maximum and minimum dollar amount spent per week for middle 50% of one-person households. Suppose that standard deviation is$5 and variable is normally distributed.
a student wants to assess whether her dog muffin tends to chase her blue ball more often than she chases her red ball.
question 1 8 marks the australian divorce rate has been steadily increasing over the years until late 1990s. however
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