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A random sample of 81 group leaders and supervisors revealed that they worked an average of 6.55 years before being promoted. The population standard deviation was 1.68 years. Using the 99% degree of confidence, what is the confidence interval for the population mean.
Three unrelated people go for dinner to a Chinese restaurant which uses MSG in its food. Each person has a 10% probability of developing an adverse reaction to the MSG.
Find the critical value z that corresponds to the given confidence level of 90%.
For a population with a mean of (u)=50 and a standard deviation of (o)=10, how much error on average would you expect between the sample mean (M) and the population mean for the following samples
Compare the differences of Simple random sampling & Cluster sampling using specific examples, and show the pros and cons of each method.
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.
Choose any medical scientific study who applied a Bayer Theorem and write down the article information (title, author, location, and date) of the article
A recent study of the Greater Los Angeles Taxi Driver Association demonstrated that the average or media tariff that they charge from Hermosa Beach to the International Airport of Los Angeles is $18.00
Find the probability that their mean energy consumption level for September is greater than 1075 kWh.
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
At the 0.10 significance level, can we conclude that the annual rates of return are higher on the big board?
A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVD owners (i.e., users).
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