A random sample of 41 calls initiated on cellular phones had a mean duration of 3.5...
A random sample of 41 calls initiated on cellular phones had a mean duration of 3.5 minutes. Find a 90% confidence interval for the mean duration of telephone calls initiated on a cellular phone. Assume the population standard deviation is 1.2 minutes
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A random sample of 41 calls initiated on cellular phones had a
mean duration of 3.5...
1. A random sample of 50 calls initiated on cell car phones had a mean duration...
1. A random sample of 50 calls initiated on cell car phones had a mean duration of 3.5 Assume the population SD 671.2 min. a) Find a 95% confidence interval for the population mean duration of telephone calls initiated on cell car phone and interpret your result ) Find a 90% confidence interval for the population mean duration of telephone calls itiated on cell car phone. Compare with the result in part a)
In a random sample of eleven cell phones, the mean full retail price was $515.50 and...
In a random sample of eleven cell phones, the mean full retail price was $515.50 and the standard deviation was $212.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean mu. Interpret the results.
In a random sample of eleven cell phones, the mean full retail price was $460.50 and...
In a random sample of eleven cell phones, the mean full retail price was $460.50 and the standard deviation was $190.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean mu. Interpret the results. Identify the margin of error.
1) In a random sample of eight cell phones, the mean full retail price was $526.50...
1) In a random sample of eight cell phones, the mean full retail price was $526.50 and the standard deviation was $184.00. Construct a 95% confidence interval for the true population price. Assume the sample was random and that the population of cell phone prices is normally distributed. Round your final answer to the nearest cent (2 numbers after the decimal)
pense QUESTION 1 A long distance phone company wishes to estimate the mean duration of long-distance...
pense QUESTION 1 A long distance phone company wishes to estimate the mean duration of long-distance calls originating in California. A random sample of 15 long-distance calls originating in California yields the following call durations, in minutes 2 5 14 11 22 28 32 21 16 15 1 19 12 2 37 Use the data to obtain a point estimate of the mean call duration for all long-distance calls originating in California 15.3 minutes 13.8 minutes 15,8 minutes 13.9 minutes...
In a random sample of eight cell phones, the mean full retail price was $460.00 and...
In a random sample of eight cell phones, the mean full retail price was $460.00 and the standard deviation was $173.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Identify the margin of error. (Round to one decimal place as needed.) Construct a 95% confidence interval for the population mean. (Round to one decimal place as needed.) Interpret...
inutes, The duration of telephone calls directed by the local telephone company: s 3.8 m 100,...
inutes, The duration of telephone calls directed by the local telephone company: s 3.8 m 100, confidence interval 98%. 4. The mean replacement time for a random sample of 20 machines is 7.5 years and the standard deviation is 2.4 years. Construct a 99% confidence interval for the standard deviation , σ , of a replacement time of all washing machines of this type (user distribution for analysis)
Random sample of 11 completed auctions for phones, sample mean price of 795 and standard deviation...
Random sample of 11 completed auctions for phones, sample mean price of 795 and standard deviation of 22.15. we wish to make a 95% confidence interval for the population mean price, the t-critical value, t .025, is closest to:
In a random sample of eight cell phones, the mean full retail price was $559.00 and...
In a random sample of eight cell phones, the mean full retail price was $559.00 and the standard deviation was $226 00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 99% confidence interval for the population mean Interpret the results o Identify the margin of error (Round to one decimal place as needed) Construct a 99% confidence interval for the population mean IA (Round to one decimal place as...
A random sample of 40 cups of coffee from a vending machine had a sample mean...
A random sample of 40 cups of coffee from a vending machine had a sample mean volume of coffee dispensed equal to 7.1 oz. with standard deviation s = 0.3 oz. Find a 90% confidence interval for the population mean amount of coffee dispensed per cup.
1. A random sample of 50 calls initiated on cell car phones had a mean duration of 3.5 Assume the population SD 671.2 min. a) Find a 95% confidence interval for the population mean duration of telephone calls initiated on cell car phone and interpret your result ) Find a 90% confidence interval for the population mean duration of telephone calls itiated on cell car phone. Compare with the result in part a)
pense QUESTION 1 A long distance phone company wishes to estimate the mean duration of long-distance calls originating in California. A random sample of 15 long-distance calls originating in California yields the following call durations, in minutes 2 5 14 11 22 28 32 21 16 15 1 19 12 2 37 Use the data to obtain a point estimate of the mean call duration for all long-distance calls originating in California 15.3 minutes 13.8 minutes 15,8 minutes 13.9 minutes...
In a random sample of eight cell phones, the mean full retail price was $460.00 and the standard deviation was $173.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Identify the margin of error. (Round to one decimal place as needed.) Construct a 95% confidence interval for the population mean. (Round to one decimal place as needed.) Interpret...
inutes, The duration of telephone calls directed by the local telephone company: s 3.8 m 100, confidence interval 98%. 4. The mean replacement time for a random sample of 20 machines is 7.5 years and the standard deviation is 2.4 years. Construct a 99% confidence interval for the standard deviation , σ , of a replacement time of all washing machines of this type (user distribution for analysis)
In a random sample of eight cell phones, the mean full retail price was $559.00 and the standard deviation was $226 00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 99% confidence interval for the population mean Interpret the results o Identify the margin of error (Round to one decimal place as needed) Construct a 99% confidence interval for the population mean IA (Round to one decimal place as...
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