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Q1) Business wishes to evaluate true mean annual income of its customers. Business requires to be within $500 of true mean. Business estimates true population standard deviation is around $2,300. If confidence level is 95%, determine required sample size to meet desired accuracy.
Q2) Area under a normal curve with mu = 15 and sigma = 2 is
A) None of these
B) 0
C) 2
D) 1
Q3) If Sam gets a 70 on a physics test where mean is 65 and standard deviation is 5.8, where does he stand in relation to his classmates?
Q4) Area to left of "z" is .9976. What z score corresponds to this area?
Q5) According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed, if we know underlying population is already normally distributed?
The first unit produced after the calibration effort to be found to be defective. What is the probability that machine is in adjustment?
Here are fifty observations on the weight of tea bags. Create mean, mode and median.
A random sample of 100 students at Southern University was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years.
If the payoff from outcome A is twice the payoff from outcome B, then the ratio of these utilities will be.
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
Compute the correlation among the variables. Describe perfect correlation also negative correlation. Utilize the following data to answer questions related.
Perform hypothesis testing on one variable's data.
If we want to increase our confidence level from 95% to 99%, what happens to our confidence interval?
Randomly select a sample of five rental agencies. Start with row two and column two. The number is 90935. Use the first two numbers starting with 90.
Make a point estimate and a 95% confidence interval estimate.
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
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