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Assume the distributions of time a customer is on hold are approximately normal. In a minimum of 5 steps, show work: Perform an appropriate hypothesis test to test whether there is a significant dif
Find the 95% confidence interval for the variance of the heights of maple trees if a sample of 21 trees has a standard deviation of 8.2 feet.
A study of peach trees found that the average number of peaches per tree was 825. The standard deviation of the population is 70 peaches per tree. A scientist wishes to find the 95% confidence inter
A scientist wishes to find the 95% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to obtain an average accurate to within 14 peaches per tree?
At a certain university, the average attendance at basketball games has been 2825. This year the attendance for the first 13 games has been 2365 with a standard deviation of 635. The athletic direct
A study of 35 apple trees showed that the average number of apples per tree was 525. The standard deviation of the population is 100. Which of the following is the 90% confidence interval for the me
An analyst from an energy research institute in California wishes to precisely estimate a 99% confidence interval of the average price of unleaded gasoline in the state.
Suppose a committee of 3 people is to be selected randomly from a group consisting of 4 men and 5 women. What is the probability that one man and two women are selected?
A company conducts random drug tests each month; employee selections are independent of any previous months' selections. If the company tests 30% of its employees each month, what proportion of empl
Suppose a committee of 3 people is to be selected at random from a group consisting of 6 men adn 4 women. What is the probability that all three people selected are men?
A student randomly guesses the answers to six questions true/false quiz. If there is a 50% chance of guessing correctly on each question, what is the probabilty that the student misses exaclty 1 que
Find a 96% confidence interval for the average customer count. Put your answers in interval notation. i.e. (a, b) where a is the lower bound and b is the upper bound of the interval. Be sure to roun
Let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. Test whether the defective rates of the parts from two suppliers are significant different at t
A competency test has scores with a mean of 69 and a standard deviation of 4. A histogram of the data shows that the distribution is normal. Use the Empirical Rule to find the percentage of scores b
Which of the following numerical summary measures is not sensitive to outliers in a dataset?
Let d = diastolic blood pressure before diet d-diastolic blood pressure after diet. Assume diastolic readings to be normally distributed. The sample mean difference of the sample is 0.8 and the samp
Sixty percent of all road accidents are due to distracted driving. In a random sample of 100 accidents, what is the probability more than 70 are due to distracted driving.
A random sample of size 100 is drawn from a population with population proportion 0.70. Find the probability that the sample proportion:
Heights of trees in a forest are normally distributed with mean 50 feet and standard deviation 12 feet. In a random sample of 36 trees what is the probability that the sample mean:
A random sample of size 64 is drawn from a population with mean 80 and standard deviation 20. Describe the sampling distribution of the sample mean.
Find the slope and intercept and write the estimated Regression equation. Fine SSE, SST, and SSR. Also find the Coefficient of Determination and interpret it. Find the correlation coefficient.
The amount of time spent watching television or playing video games is considered a significant factor on predicting childhood obesity. 290 parents of school-aged children were asked to estimate the