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A hypohesis that people should follow a 24 hr. cycle of sleeping and waking even when they are not exposed to the usual pattern of sunlight. A study of eight volunteers were placed in a room by themselves which there was no light from outside and no clocks or indications of time. They could turn the lights on & off as they wished. After a month in the room each person developed a study cycle. they are: 25,27,25,23,24,25,26,25. Using the 0.05 significance level what should we conclude about the theory that 24hrs. is a natural cycle? a) use hypothesis steps b) sketch distribution c) explain to someone who never took this course.
State the null hypothesis and the alternate hypothesis. State the significance level. State the decision rule. Give the formula for the test statistic.
Probability using Pareto chart - Evaluate the probability of randomly selecting an adult from the sample who doesn't always eat healthy foods because he or she has no time to cook or is confused about nutrition.
Rrequired service under the warranty. consider a new dealer. what is the probablity that the first claim under this warranty is the tenth car sold?
What is the value of sample mean? If the interval represents 90 % confidence interval, what would the 99 % confidence interval be?
Construct a grouped frequency distribution using six classes.
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0. Assume 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 71.
Critically discuss the difference between the standard deviation of the sampling distribution of the mean and the standard deviation of the sampling distribution of the median when we calculate the probability?
Range of 0 to 5 Volts. An environmental effect, such as a change in ambient temperature, lowers the sensitivity by 2%. What span error does this generate?
Nationwide, the average time until a electric utility customer service representative answers a call is 260 second. The Gigantic Kilowatt Energy Company rnadomly sampled 30 calls and found that, on average, they were answered in 227 second with a ..
We will randomly select 100 bags of cookies and weigh the contents of each bag selected. The probability that the sample mean will be between 14.9 and 15.1 ounces is?
If 25 quarters are randomly selected calculate an interval that will include 95% of all the mean weights of randomly selected samples of quarters of size 25.
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