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Suppose 90% of kids who visit a doctor have a fever, and 20% of kids with a fever have sore throats.What's the probability that a kid who goes to the doctor has a fever and a sore throat? The probability is ______.
Estimate and interpret the p-value of the calculated test statistic.
Assume that both samples are independant simple random samples from populations having normal distributions.
For a hypothesis test about a population proportion or mean, if the level of significance is less than the p-value, the null hypothesis is rejected.
Difference between the discrete and the continuous random variable.
lowering the price does not decrease this behavior and we should not decide to lower prices based on this research." Comment on the executive's conclusion. What type of inference is being made? Will the decision not to lower prices be a good one.
Construction of frequency distribution table for the given continuous data.
If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.
Generate survival times X from an exponential distribution with rate lambda=1 with a censoring distribution C being exponential with rate theta = 2/3. Then Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000..
For a random sample of 50 batteries, what is the probability that the sample mean will be less than 27.5 hours?
The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is normally distributed with a mean of 600 and a standard deviation of 100.
What is the coefficient of determination, and wat is its meaning?
Then, give two examples of correlation which are evaluated in a business environment and discuss the decision made by evaluating the correlation.
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