Do male and female servers work the same number of hours? A sample of 24 female servers worked an average of 40 hours per week, with a standard deviation of 4. A sample of 22 male servers worked an average of 28 hours per week, with a standard deviation of 3. Construct a 80% confidence interval for the mean difference in hours worked for male and female servers. Assume that the populations are normal with unequal variances. Round your answers to three decimal places, and use four decimal places for any interim calculations. Hint: Think about the formula for the confidence interval. How do we find tv? How do we find the standard error given that we are assuming unequal variances? We are 80% confident that the interval ( μ1 - 2 in hours worked between male and female servers. contains the true mean difference

You measure 43 dogs' weights, and find they have a mean weight of 34 ounces. Assume the population standard deviation is 13.8 ounces. Based on this, construct a 95% confidence interval for the true population mean dog weight.Give your answers as decimals, to two places

You measure 38 textbooks' weights, and find they have a mean weight of 58 ounces. Assume the population standard deviation is 3.9 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight .

In a survey, 21 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30.9 and standard deviation of $12.7. Estimate how much a typical parent would spend on their child's birthday gift (use a 90% confidence level). Give your answers to 3 decimal places. Express your answer in the format of a + E. $ 30.9 V + $ 4.770

Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"

Do male and female servers work the same number of hours? A sample of 14 female servers worked an average of 27 hours per week, with a standard deviation of 4. A sample of 23 male servers worked an average of 35 hours per week, with a standard deviation of 3. Construct a 80% confidence interval for the mean difference in hours worked for male and female servers. Assume that the populations are normal with unequal variances. Round your answers to three decimal places, and use four decimal places for any interim calculations. Hint: Think about the formula for the confidence interval. How do we find to? How do we find the standard error given that we are assuming unequal variances? We are 80% confident that the interval (-9.672 -6.328 μ₁ −μ2 in hours worked between male and female servers. Which of the following do you conclude? contains the true mean difference Female servers work more hours on average. O Male servers work more hours on average. Female and male servers work about the…

A random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday Mornings Bookstore. The standard deviation of the population is $2.14. Find the 90% confidence interval of the true mean. Please include all work showing how you found your answer.

Do male and female servers work the same number of hours? A sample of 14 female servers worked an average of 27 hours per week, with a standard deviation of 4. A sample of 23 male servers worked an average of 35 hours per week, with a standard deviation of 3. Construct a 80% confidence interval for the mean difference in hours worked for male and female servers. Assume that the populations are normal with unequal variances. Round your answers to three decimal places, and use four decimal places for any interim calculations. We are 80% confident that the interval ( μ₁ −μ₂ in hours worked between male and female servers. contains the true mean difference