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A random sample of 200 students at UCLA shows that 120 of them have internet access. Test the claim that the true population proportion of students at UCLA who have internet access is more than 55%. Use 3% level of significance. Use the P-Value method.
Sample data was collected in a study of calcium supplements and their effects on blood pressure. A placebo group and a calcium group began the study with blood pressure measurement.
You are asked to test the CFO's claim by examining monthly profits from the sample mega stores using the Z-test. State the decision rule using α = 0.05 significance level?
Calculate correlation coefficient for data below. Compute the equation for regression line if n=7, Ex=69, Ey=528 Exy=4754 and Ex^2=825
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability. Suppose that E and F are two events and that P(E and F) = 0.21 and P(E) = 0.4. What is P(FE)?
A local politician wants an estimate of the proportion of the population who support her fiscal policies. She wants the estimate to be within .06 of the true proportion. Assume a 95 percent level of confidence.
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
Find the z score corresponding to a score of X = 60 for each of the following distributions:
The company can alter the standard deviation. Use a sketch to decide how the company can proceed if they want to reduce this proportion by changing the standard deviation.
Problem based on decision tree - Evaluate the strategy that maximizes the manufacturer's expected net earnings.
What is the relationship between pretest scores and final exam scores after controlling for cumulative GPA? He also wants to know about the relationship between pretest scores and final exam scores.
Their probabilities for success on a single play are p for A and q for B, and successive plays are independent. Determine the probablity that A wins the contest given A plays first.
The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?
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