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Suppose a hypertension trial is mounted and 12 participants are randomly assigned to the standard treatment or a new treatment. Each participant takes the assigned treatment and their systolic blood pressure is recorded after 6 months on the treatment. The data are shown in the table below. Is there a difference in mean systolic blood pressure among treatments? Run the appropriate test at α= 0.05.
Standard Treatment New Treatment
124 114
111 117
133 121
125 124
128 122
115 128
Please state the test you used with hypothesis statements, p-values or confidence intervals, a detailed conclusion, and any follow-up analysis if necessary.
Scores on an endurance test for cardiac patients are normally distributed with a mean of 185 and a standard deviation of = 8. What is the probability a patient will score below 190? What is the probability a patient will score above 185
In order to measure the effectiveness of a new procedure for pruning grapes, 15 workers are assigned to prune an acre of grapes. The effectiveness is measured in worker-hours per acre for each person.
Suppose that it is desired to estimate the proportion of persons in a large population who have a certain characteristic.
Is the sanitation workers' salary significantly different from that of city workers as a whole? Conduct both one- and two-tailed tests.
After computing a confidence interval, the investigator believes that the results are meaningless because the width of the interval is too large. In reconstructing the interval, the investigator should: decrease the sample size.
The relationship between prior condom use and tubal pregnancy was assessed in a population-based case-control study at Group Health Cooperative of Puget Sound during 1981-1986. The results are shown in Table E1.3. Compute the group size and the pr..
Verify that the conditions are met.- Construct a 98% confidence interval.- Interpret your interval.- Explain what 98% confidence means in this context.
(a) How many gray levels can be quantized using a four-bit code? (b) How many bits are necessary to code a pixel quantized to 32 gray levels?
at time 0 a box contains one pen and one pencil. at each time n after a item is chosen at random from the box and put
Conclude that is there a difference in the two amounts?
suppose that a random variable x has the probability distributionfxx 0 if x lt 0x214 if 0 greaterthanorequalto x lt
Determine the natural frequencies of a uniform beam of length 1, clamped at one end and pinned at the other end.
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