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To combat antibiotic resistance, the Quality Improvement Consortium recommends a throat swab to confirm strep throat before a physician prescribes antibiotics to children under age 5. In a random sample of 97 children who received antibiotics for throat infections, 29 did not have a throat swab. At α = 0.05, is this a statistically significant reduction over last year's national rate of 40 percent?
(a-1) Choose the correct null and alternative hypotheses. H0: π ≤ 0.40 vs. H1: π > 0.40H0: π = 0.40 vs. H1: π ≠ 0.40H0: π ≥ 0.40 vs. H1: π < 0.40
(a-2) Calculate the critical value. (A negative value should be indicated by a minus sign. Round your answer to 3 decimal places.)
Critical value
(a-3) Calculate the test statistic. (A negative value should be indicated by a minus sign. Round your answer to 2 decimal places.)
Test statistic
(a-4)Interpret the results. Fail to reject H0Reject H0
(b) Is it safe to assume normality of the sample proportion p? No, normality is not justified.Yes, normality is justified.
Cardio-Pulmonary Resuscitation (CPR). In 180 days of school, about how many days can we expect that the teacher on bus duty will likely be certified in CPR?
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
Calculate a value of lambda using the data from last week concerning the news networks and the reporting practices. Compare your resulting lambda to the resulting chi-square from last week.
What is an estimate of the proportion defective for the piston manufacturing process when it is control?
The grade point average of the students at UTC is 2.80 with a standard deviation of 0.84. The grade point average of students at UTK is 2.4 with a standard deviation of 0.84. Which university shows a more dispersed grade distribution?
If B = "IBM's net profit will increase next year," identify the sample space and possible events that could occur. Use your judgment in arriving at an approximate probability for the event(s) and complement(s) you've identified.
a sample of 97 observations indicated that x1 is 87. a second sample of 153 observations indicated that x2 is 117.
1. A social scientist would like to use a pictogram in comparing the number of violent crimes against persons in 2006 with the comparable figure for 1960. Consider- ing that she can select from a wide variety of symbols to demonstrate these freque..
Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Please test the hypothesis using a = 0.05.
Find and interpret the range of the employees salaries and find the mean, variance and the standard deviation of number of successful surgeries in January 2016.
A cash flow diagram indicates the amounts paid or received by a stakeholder. For the operations and maintenance of a typical transit system in your community, list the amounts typically encountered in the cash flow stream over the life of the syst..
a small software company will bid on a major contract. it anticipates a profit of 55000 if it gets it but thinks there
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