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1. Find a peer-reviewed article that provides an example of a study that utilized a t-test for a single sample (on a topic of interest to you). Briefly describe the study and discuss its findings.2. Create a hypothesis about a topic you are interested in and then conduct a "mock" statistical test, writing out the eight steps used to apply a statistical test to your hypothesis.
A random sample of customer order totals with an average of $78.25 and a population standard deviation of $22.50. Calculate a 90% confidence interval fro the mean, given a sample size of 75 orders.
1.An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 20 metal sheets are given below. Use the simple linear regression model. ∑X = 40 ∑X2 = 200 ∑Y = 70 ∑Y2 = 545 ∑XY = 3..
Why does Course Hero state $14.95 for one month then when I try and sign up it states a min of 3 months at $19.95?
Construct a 95% confidence interval for the mean number of hours the batteries will last on these players - Determine the test statistic and determine the P-value
A statistics professor plans class so carefully that the lengths of his classes are uniformly distributed between 45.0 and 55.0 minutes. find the probability that a given class period runs greater than 50.75 minutes? find the probability of se..
Find the z-scores for which 88% of the distributions area lies within -z and z. The z-scores are ?
Yoonie is a personnel manager in a large corporation. Each month she must review 16 of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of 1.2 hours...
What would be your answer if emergencies are twice as likely to arise in the northern two-mile stretch than in the southern two-mile stretch (but are uniformly distributed within each two-mile stretch)? Find the numerical solution to this part..
Four out of five doctors prefer Fred's Aspirin." Thinking about sampling and exhaustive categories, what is wrong with this statement? Can you think of other, similarly misleading statements?
Sammy the Statistics Student wanted to estimate the difference between the population average time of his AM(x1) and PM(x2) commutes. Using 40 AM commutes and 31PM commutes, he found a 95% confidence interval for the difference of mean times of 3 to ..
4. Each member of a random sample of 15 business economists was asked to predict the rate of inflation for the coming year. Assume that predictions for the whole population of business economists follow a normal distribution with standard deviation 1..
Fast Computers Inc. supplies made-to-order personal computers through direct (telephone and online) sales channels. A key competitive feature of its business is the delivery time - the time lapse between receipt of an order and final delivery t..
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