Mean value of a random sample of 60 items was found to be 145 with standard deviation of 40. Find 95% confidence limits for population mean
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Mean value of a random sample of 60 items was found to be 145 with standard deviation of 40. Find
95% confidence limits for population mean
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- The patient recovery time from a particular surgical procedure is normallu distrubuted with a mean of 5.3 and a standard deviation of 2.1 days. what is the median recovery time? what is the z-score for a patient who takes ten days to recover?A random sample of sizen=20 has the mean 20 and standard deviation 5. What is the standard error of the mean ?Suppose the number of hours teenager are sleep normally distributed with a mean of 9 and standard deviation of 1. What percentage of teenagers sleep less than 9 hours?
- The mean score of a random sample of 60 students is 145 with a standard deviation of 40. Find the 95% confidence limit for the population mean.The number of motorcycle sold annually by salespeople is normally distributed with astandard deviation of 12. A random sample of 300 salespeople taken and the meannumber of motorcycles sold annually was found to be 75. Find the 99% confidenceinterval estimate of the population mean.The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS—electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 31 smokers found that their mean starting age was 12.1 years old. Do the data support the claim at the 5% significance level?
- The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 31 smokers found that their mean starting age was 12.1 years old. Do the data support the claim at the 10% significance level? What are the correct hypotheses? Ho: Select an answer O years H1: H1: Select an answer O ? 0 years Based on the hypotheses, find the following: Test Statistic z = (Round to 4 decimal places.) Critical Values = ± (Round to 2 decimal places.) Based on the above we choose to Select an answer The correct summary would be: Select an answer O that the mean age smokers first start is different than 13.A sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56 cm with a standard deviation of 0.09 cm. Find the 95% confidence interval for the mean length of all the inchworms in Cititon Park.The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 30 smokers found that their mean starting age was 12.2 years old. Do the data support the claim at the 1% significance level? What are the correct hypotheses? Ho: Select an answer ŷ H₁: Select an answer Test Statistic z = p-value ? î ? Based on the hypotheses, find the following: years Check Answer years (Give answer to at least 4 decimal places) (Give answer to at least 4 decimal places) Based on the above we choose to Select an answer The correct summary would be: Select an answer age smokers first start is different than 13. ↑ that the claim that the mean
- The distribution for the time a patient of a medical center spends waiting for an appointment is normal with mean of 35 minutes and standard deviation of 12 minutes. Assume worst case scenario, what is the expected wait time for the upper 1% of patients at this clinic?The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 31 smokers found that their mean starting age was 12.4 years old. Do the data support the claim at the 1% significance level? What are the correct hypotheses? Ho: P Test Statistic z = EV Critical Values =+ #v 8° 13 H₁: U Based on the hypotheses, find the following: 13 (Round to 4 decimal places.) (Round to 2 decimal places.) years years Based on the above we choose to Fail to reject the null hypothesis ✓ The correct summary would be: There is not enough evidence to support the claim ✓ smokers first start is different than 13. that the mean ageThe scores on a standardazed test are normally distributed with a mean of 115 and standard deviation of 7. What test score is 0.45 standard deviations below the mean?