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In a manufacturing process a random sample of 49 bolts manufactured has a mean length of 1.67 inches with a standard deviation of .07 inches. What is the 80% confidence interval for the mean
The 80% confidence interval is (?- , -?-)
1. Chebyshev's vs. the empirical theorem/rule.
A coin tossed 100 times and 530 heads appear. At a=0.05, test the claim that this is a non biased coin. Use a P-Value. does this suggest the coin is fair?
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
for the dataset test if there is a difference in the variances of the passes completed by the two players using ? 0.01
A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean ..
A random sample of 100 automobiles has a mean speed of 36 miles per hour and a standard deviation of 5 miles per hour. Is there enough evidence to support the claim at alpha=0.05?
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
The overall model statistically adequate at a 0.05 level of significance for predicting sale price(y)? For a moving average which is not true?
Cholesterol levels are measured as followed: 185 225 240 196 175 180 194 147 223. Generate a 95% confidence interval for the true mean total cholesterol levels in children?
What is the difference between a z-test and a t-test? When estimating population mean, how would you determine the optimal sample size when the maximum error limit is known
Suppose that a large corporation surveys all of their employees, and finds that 24% of them carry secondary health insurance. A representative from GoldStar Care visits 100 employees
a quality-control technician must select a sample of 10 dresses from a production lot of 74 couture dresses. how many
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