A sample of 8 adult elephants had an average weight of 12,300 pounds. The standard deviation for the sample was 22 pounds. Find the 95% confidence interval of the population mean for the weights of adult elephants.
A sample of 8 adult elephants had an average weight of 12,300 pounds. The standard deviation...
A sample of 25 adult elephants had a mean weight of 9500 pounds with a sample standard deviation of 150 pounds. The population distribution is normal. The margin of error for 99% confidence interval calculation is equal to: a, 61.9 b. 77.3 c. 83.9 The 99% confidence interval for the population mean is equal to: a, (9416.1, 9583.9) b. (9422.7, 9577.3) c. (8438.1, 9561.9)
A random sample of 45 adult elephants had the sample mean weight of 12,240 pounds and the sample standard deviation of 450 pounds. A random sample of 80 adult hippos had the sample mean weight of 5,700 pounds and the sample standard deviation of 400 pounds. Assume that the two populations are approximately normally distributed. A zoologist claims that the difference between the overall weights of adult elephants and adult hippos is 6,300 pounds, however others believe the difference must...
In a random sample of 64 trout, the average weight is 3 pounds, with standard deviation s = .5 pounds Find: sample mean standard error of the sample mean margin of error 95% 95% confidence interval for the population mean, µ:
Previous 21 22 23 24 25 26 Next Question 21 of 26 (3 points) 7.3 Section Exercise 11 A sample of 9 adult elephants had an average weight of 11,965 pounds. The standard deviation for the sample was 24 pounds. Find the 90% confidence interval of the population mean for the weights of adult elephants. Assume the variable is normally distributed. Round intermediate answers to at least three decimal places. Round your final answers to the nearest whole number. Question...
Exercise: An ethologist is interested in determining the average weight of adult Olympic marmots. It would be expensive and impractical to trap and measure the whole population, so a random sample of 16 adults is trapped and weighed. The sample has a mean of 7.3 kg and a standard deviation of 0.48. It is known from past studies that the distribution is approximately normal with standard deviation of 0.5. Find the 95% confidence interval for the average weight of adult...
The average of 65 randomly selected compact automobiles was 2728 pounds. The sample standard deviation was 350 pounds. Find the 99% confidence interval of the true mean weight of the automobiles.
A test on a random sample of 50 water balloons yielded a sample average weight of 1.2 pounds. Prior studies have shown that the population standard deviation is 0.2 pounds. Assume that water balloon weight is normally distributed. Construct a 95% confidence interval of the population mean?
Amanda Reaves , a zookeeper, wants to estimate the average weight gain of elephants who are on a new diet plan. A preliminary study found the standard deviation was estimated to be 5.50 kilograms. Determine the sample size that is required to estimate a population mean to within 0.95 kilograms with a 90% confidence interval.
You measure 40 elephants' weights, and find they have a mean weight of 67 ounces. Assume the population standard deviation is 3.5 ounces. Based on this, construct a 90% confidence interval for the true population mean elephant weight. Give your answers as decimals, to two places ___±____ ounces
Question 12 8 pts A study of 80 mice showed that their average weight was 6.8 ounces. The standard deviation of the population is 0.9 ounces. Which of the following is the 99% confidence interval for the mean weight per mouse? (5.4408, 8.7502) (6.0408,7.9502) (6.5408, 7.0592) (5.9408,8.1502) Question 13 8 pts 57 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 13,5 pounds; the population standard deviation for all packages is...