Question 8 of 16 -/1 View Policies Current Attempt in Progress What sample size is needed to give a margin of error within +0.8 in estimating a population mean with 90% confidence, assuming a previous sample had s = 28. Round your answer up to the nearest integer. sample size = i eTextbook and Media Attempts: 0 of 6 used Submit Answer Save for Later III

To determine if their 1.50 centimeter bolts are properly adjusted, Norman & Mayer Manufacturing has decided to use an X-Chart which uses the range to estimate the variability in the sample. Table Control Chart Answer How to enter your answer (opens in r Step 1 of 7: What is the Center Line of the control chart? Round your answer to three decimal places. Period 1 2 3 4 5 6 Copy Table Tables Select the Copy Table button to copy all values. To select an entire row or column, either click on the row or column header or use the Shift and arrow keys. To find the average of the selected cells, select the Average Values button. ON obs1 obs2 1.45 1.52 1.55 1.51 1.51 1.50 1.50 1.53 1.46 1.53 1.52 1.54 1.51 1.50 1.50 1.52 1.46 1.47 1.52 1.53 1.53 1.54 1.53 1.53 1.53 1.53 1.54 1.48 1.54 1.49 1.53 1.50 7 1.46 1.46 1.54 1.48 1.49 1.51 8 1.47 1.48 1.51 1.51 1.53 1.50 9 1.50 1.54 1.54 1.53 1.53 1.49 10 1.54 1.49 1.55 1.51 1.51 1.50 Keypad Copy Table Average Values The average of the selected cell(s)…

When it comes to estimating population parameters from sample statistics, how does the degree of freedom relate to the reliability (or uncertainty) of our calculation? For instance, what would happen to our estimate in relation to the true parameter if we used too many or too few degrees of freedom?

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"

Suppose I want to sample the household incomes for EBR parish. Let's say I start with a simple random sample of 100 residents and calculate the sample mean. How would the sampling distribution of    change if I increase the sample size to 1,000 residents?

Part 2 Q11 Help

What sample size is needed to give a margin of error within +2.5% in estimating a population proportion with 99% confidence? We estimate that the population proportion is about 0.3. Round your answer up to the nearest integer. Sample size = ! %3D