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Suppose you know that the distribution of sample proportions of the residents of one town over 70 years old in samples of 110 residents is normal with a mean of 0.12 and a standard deviation of 0.03
Compute the population standard deviation for this random variable and use your answer from the previous question in order to complete the following observation: Out of a population of 10000 custome
The mean of a normal distribution is 406 pounds. The standard deviation is 10 pounds. What is the area between 422 pounds and the mean of 406 pounds?
A national manufacturer of unattached garages discovered that the distribution of the lengths of time it takes two construction workers to erect the Red Barn model is normally distributed with a mea
What is wrong with this statement? High linear correlation proves that the explanatory variable (variable x) caused the response variable (y) to happen.
A bank wishes to estimate the mean credit card balance owed by its customers. The population standard deviation is estimated to be $297. If a 98 percent confidence interval is used and an interval o
If the null hypothesis that two means are equal is true, where will 99% of the computed z-values lie between?
What is the decision rule at the 0.01 level of significance to test if the new design increased the absorption amount of the sponge?
A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 12 students. Their average age was 20.7 years with a standard d
The proportion of junior executives leaving large manufacturing companies within three years is to be estimated within 2 percent. The 0.95 degree of confidence is to be used. A study conducted sever
In a murder trial in Los Angeles, a shoe expert stated that the range of heights of men with a size 12 shoe is 70 inches to 77 inches. Suppose the heights of all men wearing size 12 shoes are normal
The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $38,710 and a standard deviation of $794. About 72 percent of the i
An investigator hypothesizes that cholesterol levels in children might be effected by educating their parents on proper nutrition and exercise.
An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. Seven customers were randomly selected and co
A 90% confidence interval for a proportion is (0.265, 0.385). What is the probability that the population proportion is greater than 0.385?
The results of a mathematics placement exam at two different campuses of Mercy College follow:
A two-variable data set has a correlation coefficient of 0.84. What is the coefficient of determination?
Find the probability of rolling a six first and a two second when rolling a fair six-sided die.
The Central Limit Theorem helps researchers answer questions about Sample means, for small sample sizes.
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponge
Which of the following is not a property of all normal distributions?
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings.
A binomial experiment has 10 trials with a probability of success of 0.62 in each trial. What is the standard deviation of the binomial random variable?
The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $39,570 and a standard deviation of $798. About 65 percent of the i