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1. A random sample of 89 observations produced a mean x (x bar) = 25.8 and a standard deviation s= 2.4.- find a 95, 90, and 99% confidence interval for u.2. In a sample of 304,000 items mailed between Dec. 10 and Mar. 3, the accounting firm determined that 268,100 items were delivered on time. Assuming a confidence level of 95%, the likelihood of an item being delivered on time is in the interval __ , __.3. The mean gas mileage for a hybrid car is 56 miles per gallon (MPG). Suppose that the gas mileage is approximately normally distributed with a standard deviation of 3.3 MPG. a. The probability that a randomly selected hybrid gets more than 62 MPG is __?b. The probability that a randomly selected hybrid gets 50 MPG or less is __?c. The probability that a randomly selected hybrid gets between 57 and 62 MPG is __?d. The probability that a randomly selected hybrid gets less than 46 MPG is __?4. The random sample shown below was selected from a normal distribution. 9, 3, 7, 3, 9, 5.a. construct a 95% confidence interval for the population mean u __ , __.b. assume that sample mean x (x bar) and sample standard deviation s remains exactly the same as those you just calculated but that are based on a sample of n=25 observations.
5. Repeat part a. what is the effect of increasing the sample size on the width of the confidence intervals? The confidence interval is __ , __? 6. What is the effect of the sample size on the width of the confidence interval? As the sample size increases, the width increases, stays same or decreases?
What is the shape of the distribution of credit hours? Compute summary statistics and use StatCrunch to construct a histogram of the credit hour data. Include a short paragraph answering the question. - RSCH202 - Quantitative Data Analysis Assignme..
Peter hopper, director of quality control for harley davidson
An analysis was done to see if there was a correlation between the number of days of class missed and a student's GPA.
Assume the random variable x is normally distributed with a mean of 50 and a standard deviation of 7. Find the indicated probability. P(x>36)
Which result had the margin of error of ±9 percentage points?
A crucial step is offering participants a food reward
You take a random sample of size 100 from a normal population with unknown mean but known standard deviation 40. You plan to test H(null): mu=85 versus H(alternative): mu > 85. Your procedure will be to observe the sample then reject H(null) is xbar>..
What is the probability that the experiment will find (misleadingly) that the mean score for delayed speaking is at least as large as that for early speaking?
In a certain city the need for money to buy alcohol is given as the reason for 60% of all thefts. What is the probability that the exactly 2 of the next 4 theft cases reported in this city did not result from the need for money to buy alcohol?
1) The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered. Use exponential smoothing with a smoothing constant of .8 to forecast attendance for the eighth year. 75, 78, 75, 120, ..
the pdf for 3 parameter frechet distribution is ltbrgtfxa?a x-?-a-1 exp-x-?-a ltbrgtthen how we can prove the cdf for
Descriptive statistics and inferential statistics
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