The significance level alpha (a) is needed to identify the O population standard deviation Otest statistic O critical values of the test statistic O direction of the statistical test
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- If all other quantities remain the same, how does the indicated change affect the minimum sample size requirement? (a) Increase in the level of confidence (b) Increase in the error tolerance (c) Increase in the population standard deviation core C..... (a) How does an increase in the level of confidence affect the minimum sample size requirement? Choose the correct answer below. core An increase in the level of confidence V the minimum sample size required. (b) How does an increase in the error tolerance affect the minimum sample size requirement? Choose the correct answer below. core An increase in the error tolerance V the minimum sample size required. (c) How does an increase in the population standard deviation affect the minimum sample size requirement? Choose the correct answer below. An increase in the population standard deviation V the minimum sample size required.The lengths of lumber a machine cuts are normally distributed with a mean of 105 inches and a standard deviation of 0.5 inch. (a) What is the probability that a randomly selected board cut by the machine has a length greater than 105.14 inches? (b) A sample of 35 boards is randomly selected. What is the probability that their mean length is greater than 105.14 inches? I need help with part b, please! Question content area bottom Part 1 (a) The probability is . 3897.3897. (Round to four decimal places as needed.) Part 2 (b) The probability is enter your response here.Ankit
- Determine the critical values for these tests of a population standard deviation. (a) A right-tailed test with 12 degrees of freedom at the a = 0.1 level of significance (b) A left-tailed test for a sample of size n= 30 at the a= 0.05 level of significance (c) A two-tailed test for a sample of size n= 25 at the a= 0.01 level of significance Click the icon to view a table a critical values for the Chi-Square Distribution. (a) The critical value for this right-tailed test is (Round to three decimal places as needed.)I need help with test statistic number pleaseResearchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0 2 32 34 -2 3 24 25 -1 4 28 30 -2 5 26 29 -3 What is the estimated standard deviation (i.e., s) here? Round to 2 decimal places.
- Sketch a bell curve for the SAT critical reading data with markings on the horizontal axis for +1 standard deviation, ±2 standard deviations, and ±3 standard deviations.The latest antidepressant produced is currently involved in the testing process. Eight subjects have joined the testing process where the mean number of days taken before side effects disappeared is being examined. The results are as follows. 14, 13, 18, 28, 19, 20, 23, 24 n USE SALT (a) How many degrees of freedom are present in this study? (b) What is the point estimate (in days)? days What is the standard deviation (in days) of the sample? (Round your answer to four decimal places.) days (c) What is the 95% confidence interval (in days) for the population mean? (Use a table or SALT. Round your answers to three decimal places.) ) days (d) Interpret the 95% confidence interval for the population mean. O we are 95% confident all results are in this interval. O we are 95% confident that the true mean is contained in the interval. O we know that 95% of the results will be in the interval. O Ninety-five percent of the data are outside of the interval.What are the critical values for a two-tailed test with a 01 level of significance when the population standard deviation is known? Multiple Choice Above 1.960 and below -1960 Above 1.645 and below -1645 Above 2.576 and below -2.576 Above 1.000 and below -1.000 Next> 5 of 10 Prev < earch
- Please help 2 part questionRapid Eye Movement (REM) sleep is the sleep when a person has dreams. A researcher wants to investigate whether children have more REM than adults. She selects a random sample of 10 children and obtained a mean of 2.9 hours and standard deviation of 0.48 hours for the duration of REM sleep. She also selected a random sample of 10 adults and the mean and standard deviation of the duration of their REM sleep 8. were 2.1 hours and 0.68 hours. A. than the average REM for adults? Use the p-value method. At a = 0.05, is there enough evidence to conclude that the average REM for children is higher В. Find the 95% confidence interval for the difference between the average REM for children and the average REM for adults. Interpret your results.is interested in comparing the mean sales revenue per A company salesperson at two different locations. The manager takes a random sample of 10 salespeople from each location independently and records the sales revenue generated by each person during the last four weeks. He decides to use a t-test to compare the mean sales revenue at the two locations. Which of the following assumptions is necessary for the validity of the t-test? * The population of the sales records at each location is normally distributed. The population standard deviations at both locations are not equal. None of these The population of the difference in sales records computed by pairing one salesperson from each location is normally distributed. The population standard deviations at both locations are known. The population standard deviations at both locations are equal.
