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Describe the three most common causes of strength degradation of mechanical components. Give examples of each, with descriptions of methods used to prevent or reduce the chances of failure.
Computing a two-independent sample t-test is appropriate when?
To increase the value of estimated Cohen's d, a researcher increases the sample size. Will this change the value of d?
A researcher conducts a study and concludes that a new behavioral health treatment program significantly reduces one's risk for disease compared with risk levels in the general population (d = -0.64
let x be a discrete random variable with a pmf: p(X) = c * (.6)^x , x = 1,2,3..
Compute the mean and standard deviation for the time to complete calls to English-speaking service representatives. Compute the mean and standard deviation for the time to complete calls to Spanish-sp
let x be the age in years of a car driver and let y be the percentage of all accidents (for a given age) due to speeding. perform:A) draw the scatter plot. B) compute the correlation coefficient. C)
The distribution of the sum of 100 independent identically distributed random variables is:
How many ways are there to pick five people for a committee if there are six (different) men and eight (different) women and the selection must include at least one man and one woman?
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use a binomial probabilities table to find the probability of x successes given the probability p of success on
Sketch the areas under the standard normal curve over the indicated intervals, and find the specific areeas.
If the mean score was mean = 155 with a standard deviation of =15, what was the final exam score for Sue?
Let x be a random variable that represents the weight in ounces of a healthy 10-week old kitten. Assume that x has a distribution that is approximately normal. Calculate the Standard Deviation from
What is the sample space in this experiment? List the outcomes in the event of getting a two letter word with a dictionary meaning in this experiment.
Suppose you randomly select 100 college students from this population. There would be a 68% chance that the mean (x) amount spent on textbooks would be between:
A student has 40% chance of getting a scholarship. Consider a group of 10 students. What is the probability that exactly 3 students would get scholarships?
The distribution of the sum of independent N(?, ?2) random variables is:
Write down the pdf for each of the following distributions, then sketch the distributions on the axes provided (be sure to indicate which is which). a) N(2,9), b) N(0,1)
McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the mi
Mrs. Smith's reading class can read an average of 175 words per minute with a standard deviation of 20 words per minute. Suppose that words per minute is approximately normally distributed. The top
Calculate the standard deviation for the following sample, and show your work. Use the formula of your choice. Use the empty cells to facilitate your calculations.
The probability that a radish seed will germinate is 0.7. The gardner plants 140 seeds, what is the probability that she harvests less than 100 radishes. Use the normal curve approximation for biono
The Body Mass Index (BMI) was recorded for 40 males. Find the 5-number summary that would be used for a box plot of this data.
List the measures of center from the least affected by outliers to the most affected by outliers.
A student gets quiz grades of 55,70,82, and 94. He gets a score of 85 on his final exam. Find the weighted mean if the quizzes each count 15% and the final exam counts for 40% of the final grade.