It is hypothesized that there is a difference in job satisfaction between those who receive regular feedback on their job performance and those who receive irregular feedback." is an example of which type of hypothesis? a. Directional hypothesis b. Not a hypothesis c. Null hypothesis d. Non-directional hypothesis

Last year's mean hourly wage (in dollars) for all hospital clerical workers in a large state was 8. An administrator for the state believes that this year's mean hourly wage for hospital clerical workers is greater than last year's mean. She hires statisticians to sample a number of hospital clerical workers and to carry out a hypothesis test. State the null hypothesis H, and the alternative hypothesis H, that would be used for this test. H. 文 H. OO ロ=ロ ローロ

A teacher is comparing the mean study time of his freshmen and senior students. He believes that his senior students spend more time studying per week than his freshmen students and decides to perform a hypothesis test  on this belief. a. suppose the decision of the hypothesis test is to reject the null hypothesis. If, in reality, freshmen study for a mean of 10 hours per wekk and seniors study for a mena of 15 hours per week, was an arror made? If so, what type?  b. Suppose the decision of the hypothesis test is to fail to reject the null hypothesis. If, in reality, freshmen study for a mean of 15 hours per week and seniors study for a mean of 15 hours per week, was an error made? if so, what type?

Suppose that a hypothesis test is performed at a small significance level. State the appropriate conclusion in each case by referring to Key Fact 2. a. The null hypothesis is rejected.b. The null hypothesis is not rejected.

Using the accompanying data of restaurant sales, determine if the vanance of weekday sales is the same as that of weekend sales for each of the three variables (lunch, dinner, and delivery). Click the icon to view the restaurant sales data. Is there sufficient evidence at the 0.01 level of significance to condude that the vanance of weekday sales is the same as that of weekend sales for lunch sales? Determine the null hypothesis, H. and the alternative hypothesis. H₁. Let weekend sales be population 1 and weekday sales be population 2. H₂ Hi 11 (Type integers or decimals. Do not round.) Compute the test statistic (Round to two decimal places as needed.) Survey data Date Day Lunch Sales $ Dinner Sales $ Delivery Sales $ 4-Apr Wednesday 358 789 293 11-Apr Wednesday 386 665 299 18-Apr Wednesday 426 628 289 25-Apr Wednesday 331 729 253 3-Apr Tuesday 296 848 325 10-Apr Tuesday 308 572 328 17-Apr Tuesday 297 568 358 24-Apr Tuesday 229 529 402 5-Apr Thursday 402 808 273 12-Apr Thursday 420…

iPad Kindle 9 10 5 9 8 10 7 9 8 12 9 10 11 10 11   Consumer Reports would like to conduct a hypothesis test to determine if the average battery life for an iPad is different from the average life for a Kindle Fire.             The data provided here represent the battery life from a random sample of iPads and Kindle Fires in hours.   (a)     Conduct a two-sample t test to test if the average battery life for an iPad is different from the average life for a Kindle Fire. Provide the output below starting at the Yellow highlighted cell. Use 1% significance level.   (b) Compute a 99% confidence interval for the difference in the average battery life for an iPad and the average life for a Kindle Fire. Provide your final anwers in the yellow highlighted cells below. ( Keep 3 or more decimal places) Show your work below those cells. Upper= Lower=

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population that is known to have a mean of ? = 80. The results will be examined using a one-tailed hypothesis test. Which of the following is the correct statement of the null hypothesis? ? < 80 ? ≥ 80     ? > 80 ? ≤ 80

In a study of 819 randomly selected medical malpractice lawsuits, it was found that 473 of them were dropped or dismissed. Use a 0.01 significance level to test the claim that most medical malpractice lawsuits are dropped or dismissed. Which of the following is the hypothesis test to be conducted? ОА. Но: р30.5 H;: p> 0.5 ОС. Но: р0.5 H1: p= 0.5 OF. Ho: p= 0.5 ОЕ. Но: р-0.5 H1: p#0.5 H1: p<0.5 What is the test statistic? (Round to two decimal places as needed.) What is the P-value? P-value = (Round to three decimal places as needed.)

"In your response indicate whether CPAs in states that have flat state income tax rates work fewer hours per week during tax season compared to the US average. You will want to formally set up H0 and Ha, report either the test statistic (z-value) or p-value, and explain why you either reject or fail to reject your null hypothesis."

Which of the following types of study support external validity? a.  A study using non-randomly selected participants b.  A study that adds a new independent variable c.  A study that is a direct replication d.  A failed replication study   B is the answer but why adding new independent variable can support external validity? (please type, no hand-writing)