A study of 420,050 cell phone users found that 131 of the developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0226% for those not using cell phone. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. Do cell phone users appear to have a rate of cancer of the brain or nervous system that is different from the rate of such cancer among those using cell phones? Why or why not?

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Use the given margin of error, confidence level, and population standard deviation, to find the minimum sample size required to estimate and unknown population mean.

Margin of error: 1.3 inches, Confidence level: 90%, Standard deviation=2.3 inches


A confidence level of 90% requires a minimum sample size of?

Salaries of 33 college graduates who took a statistics course in college have a mean of $66,400. Assuming a standard deviation of $14,525, construct a 95% confidence interval for estimating the population mean.

Listed below are measured amounts of lead (in micrograms per cubic meter) in the air. The EPA has established an air quality standard for lead of 1.5 micrograms per cubic meter. The measurements shown below were recorded at a building on different days. Use the given values to construct a 95% confidence interval estimate of the mean amount of lead in the air. Is there anything about this data set suggesting that the confidence interval might not be very good?

5.40 0.90 0.33 0.67 0.69 1.10

What is the confidence interval for the population mean?

Examine the given statement, then express the null hypothesis and the alternative hypothesis in symbolic form.

The mean weight of women who won a beauty pageant is equal to 120 lbs.

Find the critical z values. Assume that the normal distribution applies.

a=0.08; H1 is P<0.14

So Penny, tell me.....have you tried to actually do any of these problems yourself? Or maybe it's easier to just do the copy and paste and spam us rather than trying to learn...

We don't do homework for you. If you try to do the problem and get stuck, you can ask for HELP and maybe someone will come along and help you with it...but to just post all the questions and then sit back and wait for an answer...no, it's not going to happen.

In a survey of 145 senior executives, 52.4% said that the most common job interview mistake is to have little or no knowledge of the company. Test the claim that in the population of all senior executives, 45% say that the most common job interview mistake is to have little or now knowledge of the company. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. Use the P-value method. Use the normal distribution as an approximation of the binomial distribution.