In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The management of Rock City recently undertook an extensive promotional campaign. They are interested in determining whether the promotional campaign actually increased the proportion of tourists visiting Rock City. The correct set of hypotheses is   a. H0: p > .75     Ha: p  .75.   b. H0: p  .75     Ha: p > .75.   c. H0: p  .75     Ha: p < .75.   d. H0: p < .75     Ha: p  .75.

In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation in statistical polling is the margin of error - the largest (reasonble) error that the poll could have. For example, a poll result of 72% with a margin of error of 4% indicates that p is most likely to be between 68% and 76% (72% minus 4% to 72% plus 4%).   In a (made-up) poll, the proportion of people who like dark chocolate more than milk chocolate was 37% with a margin of error of 2.5%. Describe the conclusion about p using an absolute value inequality.   . That lets you type in a vertical bar | to represent absolute values. Also, when you type in  <  and then =, the symbolic entry option will automatically convert that to  ≤ . In the same way, if you type in  >  and then =, the symbolic entry option will automatically convert that to  ≥.   Be sure to use decimal numbers in your answer (such as using 0.40 for 40%).

Analyze Valley Hospital's admissions time variance Valley Hospital began using standards to evaluate its Admissions Department. The standard was broken into two types of admissions as follows: The unscheduled admission took longer because name, address, and insurance information needed to be determined and verified at the time of admission. Information was collected on scheduled admissions prior to admitting the patient, thus requiring less time in admissions. The Admissions Department employs two full-time people for 40 hours per week at $15 per hour. For the most recent week, the department handled 66 unscheduled and 120 scheduled admissions. a. How much was actually spent on labor for the week? $b. What are the standard hours for the actual volume of work for the week? (Round to the nearest whole hour.) hours c. Compute the direct labor time variance, and report how well the department performed for the week. In your computation, round the standard direct labor rate to the nearest…

​Recently, a health organization estimated that the flu vaccine was 75​% effective against the influenza B virus. An immunologist suspects that the current flu vaccine is less effective against this virus. Pick the correct pair of hypotheses the immunologist could use to test this claim.       Question content area bottom Part 1 Choose the correct answer below.     A. H0​: p>0.75 Ha​: p<0.75   B. H0​: p=0.75 Ha​: p>0.75   C. H0​: p=0.75 Ha​: p<0.75   D. H0​: p=0.75 Ha​: p≠