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The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. Random samples of 100 women are randomly selected and the mean of each sample is determined. Find the standard deviation of the sampling distribution.
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities.
Test the hypothesis, at the 0.05 level of significance, that the size of a family is independent of the level of education attained by the father.
In a normal population with sigma=20, a random sample of size n gave X(mean)=56.53. At the 5% significance level, make a two-tailed test of the null hypothesis mu=50, when (a) n=24 (b) n=36
events a and b are mutually exclusive. suppose event a occurs with probability 0.29 and event b occurs with probability
The city are below $25,000. Find the mean of the annual household incomes of this city. It is assumed that the annual household incomes follow a normal distribution.
Computing the probability values using normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
Utilize the given degree of confidence also sample data to construct a confidence interval for population proportion.
The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2. What is the t score?
estimating confidence interval for mean value of y dependent variable.consider the simple linear regression of y
How many ships must be included in the sample if the CEO wants the error to be within 0.02 and a confidence level of 95% if: there is no information available that could be used as an estimate of the population proportion?
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
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