A random sample of size 9 is taken from normal distribution with variance 36, the sample mean is 128. The 99% confidence interval of the population mean is equal to: O (124.7,131.3) O (124.08, 131.92) O (122.84 , 133.15) None of these
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- Use the sample information x⎯⎯x¯ = 37, σ = 6, n = 15 to calculate the following confidence intervals for μ assuming the sample is from a normal population.Salaries of 46 college graduates who took a statistics course in college have a mean, x, of $61,400. Assuming a standard deviation, σ, of $19,045 , construct a 90% confidence interval for estimating the population mean.A researcher makes a research about the life time of batteries which have a normal distribution. In order to understand the life time of batteries s/he randomly selected 49 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 80 % confidence interval for the true population mean of life time of batteries. O (45.20 , 50.80) O (47.09 , 48.91) 3831 O (46.83, 49.17) O There is no correct answer O (46.26 , 49.71)
- SAT math scores are normally distributed with mean (524) and a standard deviation (95). If 1800 SAT math scores are randomly selected, about how many would be expected to be greater than 545?In a random sample of 19 people, the mean commute time to work was 33.6 minutes and the standard deviation was 703 minutes. Assume the population is normally distributed and use a t- distribution construct a 80% confidence interval for the population mean u. What is the margin error of u? Interpret the results.The sample mean and standard deviation for weights of 100 boxes are 12.05g and 0.1g respectively. Find a 90% confidence interval for the mean weight of the boxes.
- The random sample shown below was selected from a normal distribution. 8, 10, 7, 5, 3, 3 O Complete parts a and b. a. Construct a 99% confidence interval for the population mean u. | D (Round to two decimal places as needed.)Compute a 95% confidence interval for the true population mean given the following 10 data that represent a sample of ceramics vessels with the following rim diameters (in centimeters), the sample mean to be x̄ = 15.3 cm and the sample standard deviation is s = 3.5 cmA pizza delivery chain advertises that it will deliver your pizza in 25 minutes from when the order is placed. Being a skeptic, you decide to test and see if the mean delivery time is actually more than 25 minutes. For the simple random sample of 11 customers who record the amount of time it takes for each of their pizzas to be delivered, the mean is 27.7 minutes with a standard deviation of 2.9 minutes. Assume that the population distribution is approximately normal. Perform a hypothesis test using a 0.10 level of significance. Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Ho : µ = 25 25 Answer 国 Tables 国 Keypad Keyboard Shortcuts O
- Salaries of 34 college graduates who took a statistics course in college have a mean, x, of $67,400. Assuming a standard deviation, o, of $15,845, construct a 90% confidence interval for estimating the population mean u.A pizza delivery chain advertises that it will deliver your pizza in 35 minutes from when the order is placed. Being a skeptic, you decide to test and see if the mean delivery time is actually more than 3535 minutes. For the simple random sample of 15customers who record the amount of time it takes for each of their pizzas to be delivered, the mean is 40.4 minutes with a standard deviation of 7.4 minutes. Assume that the population distribution is approximately normal. Perform a hypothesis test using a 0.10 level of significance. Step 3 of 3 : Draw a conclusion and interpret the decision.Use the given confidence interval to find the margin of error and the sample mean. (13.2,20.6) The sample mean is The margin of error is (Type an integer or a decimal ) (Type an integer or a decimal)