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A study of hours spent in training (per year) at a company was conducted with 49 participants. The mean number of hours spent in training was reported to be 89.25 hours. The standard deviation was 13.44 hours.
1. Compute a 95% confidence interval for the average time spent in training per year at this firm.
2. Develop a graph showing the data below as a frequency distribution. Note the mean and the confidence interval on the graph.
$210 220 230 240 270 300 300 320 320 320
340 370 370 380 400 410 450 450 470 470
490 500 500 510 510 540 570 580 580 640
490 500 500 510 510 540 570 580 580 610
610 620 640 640 650 660 690 750 760 790
Random sample of 64 services is selected. Assume the population consists of 400 services. Find out the standard error of mean.
At a 5% level of significance, is there sufficient evidence that the population mean waiting time is now less than 3.7 minutes?
In a pilot study, five kids are given several problems of each type to practice (and then tested on three problems), in one of the three Sequences: D-R-T, T-D-R, OR R-T-D.
The superintendent of a printing plant has selected a random sample of 100 rolls of paper from a large shipment. The average length of the sample rolls is 416 feet, with a variance of 2704 feet.
Write out the multiple regression equation using the given data.
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary ..
Find the probability that a random sample of 4 male Siberian tigers will have a sample mean weight more than 450 lb.
Findout the value of X using normal distribution which gives standard deviation also mean. A math teacher gives two different tests to measure students' aptitude for math.
Use value you found in part a to find out degree of confidence for interval 65.65
Consider a hypothesis test of H0: μ = 0 against H1: μ > 0 where μ is the mean percent change in total body bone mineral content of young women. The population standard deviation is σ = 2. The level of significance for the test is α = 0.05.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
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