A random sample of 10 travel brochures showed sample mean cost of an 8-day cruise to the Bahamas $1,978. (1st class, double occupancy). The sample standard deviation was $250. An independent random sample of 12 travel brochures showed mean cost of a comparable 8 day cruise to Mexico $2,150 with sample standard deviation $275. Test to see if the population mean costs for the two types of cruises are different. Use a 1% significance level.
A random sample of 10 travel brochures showed sample mean cost of an 8-day cruise to...
The random sample data analysis showed that the mean salary of 40 elementary school teachers in study showed $28,500. Is the sample data within or out of the 95% CI the reference information (a mean of $27,000 and a standard deviation of $2,000)? Show me the process how to prove true or false on this statement (use 95% CI).
a simple random sample of 17 containers showed a mean volume of 1.0183 liters and a standard deviation .003 liters. construct the 99% confidence interval estimate of the standard deviation if the volume for all such containers a. state the two values b. show the formula and computations used in computing the confidence interval. state the confidence interval rounding to three decimals
A random sample of 29 lunch orders at Noodles & Company showed a mean bill of $9.60 with a standard deviation of $5.73. Find the 95 percent confidence interval for the mean bill of all lunch orders. (Round your answers to 4 decimal places.) to The 95% confidence interval is from
The mean height of a random sample of 47 students who take part in athletic activities at a College is 175cm with a standard deviation of 5cm while a random sample of 132 students who showed no interest in athletics had a mean of 170cm and a standard deviation of 7cm. (a) Construct a 99% confidence interval for the difference in the mean heights of the two groups of students. (b) Are students who take part in athletic activities taller?...
The mean height of a random sample of 47 students who take part in athletic activities at NRDC is 175cm with a standard deviation of 5cm while a random sample of 132 students who showed no interest in athletics had a mean of 170cm and a standard deviation of 7cm. (a) Construct a 99% confidence interval for the difference in the mean heights of the two groups of students. (b) Are students who take part in athletic activities taller? Test...
a simple random sample of 17 containers showed a mean volume of 1.0183 liters and standard deviation .003 liters. construct the 99% confidence interval estimate of the standard deviation if the volume for all such containers a. state the two values b. show the formula and computations used in computing the confidence interval. state the confidence interval rounding to three decimals.
A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. Refer to Exhibit 8-2. The standard error of the mean is
3. A simple random sample of 12 containers showed a mean volume of 0.997 liters and standard deviation .006 liters. Construct the 99% confidence interval estimate of the standard deviation of the volume for all such containers. a. State the two critical values. b. Show the formula and computations used in computing the confidence interval. State the confidence interval rounding to three decimals.
A pediatrician's records showed the mean height of a random sample of 25 girls at age 12 months to be 29.530 inches with a standard deviation of 1.0953 inches. Construct a 95% confidence interval for the population variance. (Round your answers to 4 decimal places.) The 95% confidence interval is from____ to ____
a simple random sample of 26 college students showed a mean credit score of 575 and a standard deviation 10. construct the 90% confidence interval estimate of the mean credit score for all college students a. state the critical value b. compute the margin of error c. state the confidence interval