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1. For the population with mean of (u)=50 and standard deviation of (o)=10, how much error on average would you expect between sample mean (M) and population mean for given samples
A sample of N= 4 scoresA sample of N= 16 scoreA sample of N=25 scores...
2. Population of IQ scores forms normal distribution with mean of µ = 100 and standard deviation of o = 15. Determine the probability of obtaining sample mean greater than M = 105.
a- For random sample of n = 9 peopleb- For random sample of n = 36 people
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
When is it best to use either of them? What types of variables can you apply them to, how many variables can each encompass, and which can be employed for a prediction of a new observation?
Engineers want to design seats in commercial aircraft so that they are wide enough to fit 98% of all males. (Accommodating 100% of males would require very wide seats that would be too expensive.)
Find the critical value Zc necessary to form a confidence interval at the given level of confidence.
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution.
Rhe frequency distribution summarizes a sample of times (in minutes) between eruptions of a cretain geyser. Find the approximate population mean and approximate population standard deviation of the data.
Determine x-bar and s for this data set. You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.
Test whether the average cycle of sleeping and waking differs significantly from 24 hours.
What is them 98% confidence interval for the average number of minutes it takes to create a test question?
Describe whether the data appear to be approximately normally distrusted by .. a. Comparing data characteristics to theoretical properties.
A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car.
A study was designed to compare variability of male and female diastolic blood pressure. The null hypothesis was that the population standard deviation were equal versus the alternative that they were not equal.
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