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A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. Provide a 95% confidence interval of the populatoin mean and interpret the results.
Nrmal distribution
For each sample, carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
Find out the probability
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
D. The Sunbeam Corporation makes a wide variety of appliances for the home. One product is a digital blood pressure gauge. For obvious reasons, the blood pressure readings made by the monitor need to be accurate.
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
When modelling E(y) with single qualitative independent variable, number of 0 - 1 dummy variables in model is equal to number of levels of qualitative variable.
there are 2 groups of education majors. they are all assigned to study a diverse neighborhood where their internship
A sample from a population with μ = 40 and =σ10 has a mean of m = 44. if the sample mean corresponds to a z = 2.00, then how many scores are in the sample?
According to the patient's history and physical examination. What are the chances of herniation if the MRI is positive?
A random sample of 35 clients' receipts gave a mean of $34.70 with standard deviation s= $4.85. Find a 90% confidence interval for the average amount spent by all clients
Use this information to construct a probability table, and then calculate each of the following probabilities: P(foreign car)
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