Diabetes:Advandia is a drug used to treat diabetes, but it may cause an increase in heart attacks among a population already susceptible. A large study found that out of 1,456 diabetics who were treated with Avandia, 27 of them had a heart attack during the study period. This was compared with 41 heart attacks among a group of 2,895 participants who were given other treatments for their diabetes. The researchers want to determine if there is evidence to suggest that there is a significant increase in the proportion of people who suffer heart attacks when using Avandia compared to other treatments.a)Are these proportions from matched-pairs data?b)What is the result of the appropriate hypothesis test, using ? = 0.05 level of significance? (Note: list out each step in your hypothesis testing procedure and show all of your work.)Step 1:Step 2:Step 3: Step 4:Step 5:

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general 9 months ago 1113

At Litchfield College of Nursing, 81% of incoming freshmen nursing students are female and 19% are male. Recent records indicate that 70% of the entering female students will graduate with a BSN degree, while 80% of the male students will obtain a BSN degree. If an incoming freshman nursing student is selected at random, find the following probabilities. (Enter your answers to three decimal places.) (a) P(student will graduate | student is female) (b) P(student will graduate and student is female) (c) P(student will graduate | student is male) (d) P(student will graduate and student is male) (e) P(student will graduate). Note that those who will graduate are either males who will graduate or females who will graduate. (f) The events described the phrases "will graduate and is female" and "will graduate, given female" seem to be describing the same students. Why are the probabilities P(will graduate and is female) and P(will graduate | female) different

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general 9 months ago 1602

Mattel Corporation produces a remote-controlled car that requires three AA batteries. The mean life of these batteries in this product is 34 hours. The distribution of the battery lives closely follows the normal probability distribution with a standard deviation of 5.5 hours. As a part of their testing program Sony tests samples of 25 batteries.What can you say about the shape of the distribution of sample mean?What is the standard error of the distribution of the sample mean? (Round your answer to 4 decimal place.)What proportion of the samples will have a mean useful life of more than 36 hours? (Round your answer to 4 decimal place.)What proportion of the sample will have a mean useful life greater than 33.5 hours? (Round your answer to 4 decimal place.)What proportion of the sample will have a mean useful life between 33.5 and 36 hours? (Round your answer to 4 decimal place.)

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general 9 months ago 2018

You wish to examine whether hot air hand blowers or paper in a medical facility have an effect on the rate of respiratory incidence. You follow 98 health care workers in primary care clinic during flu season. You observe the following incidence of respiratory disease and preferred method of hand drying. 46 workers preferred paper for hand drying, 52 preferred hot air blowers. During the study period 29 of the 98 workers experienced a respiratory illness. OBSERVED VALUES Sick Not Sick Paper 19 27 49 HotAir 10 42 52 29 68 98Your null and alternative hypothesis for the Chi Square test comparing the exposure (air vs paper) and outcome (ill or not ill is Hnull There is no association between the drying choice and ilness Halt There is an association between drying choice and illness a.True b. False

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general 9 months ago 8534

Suppose a statistics instructor believes that there is no significant difference between the mean class scores of statistics day students on Exam 2 and statistics night students on Exam 2. She takes random samples from each of the populations. The mean and standard deviation for 35 statistics day students were 75.86 and 16.91.The mean and standard deviation for 37 statistics night students were 75.41 and 19.73. The day" subscript refers to the statistics day students. The "night subscript refers to the statistics night students. Assume that the standard deviations are equal. A concluding statement is: a. There is sufficient evidence to conclude that statistics night students' mean on Exam 2 is better than the statistics day students' mean on Exam 2. b. There is insufficient evidence to conclude that the statistics day students' mean on Exam 2 is better than the statistics night students' mean on Exam 2. c. There is insufficient evidence to conclude that there is a significant difference between the means of the statistics day students and night students on Exam 2 d. There is sufficient evidence to conclude that there is a significant difference between the means of the statistics day students and night students on Exam 2

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general 9 months ago 4594

University degree requirements typically are different for Bachelor of Science degrees and Bachelor of Arts degrees. Some students get a Bachelor of Arts and Science degree, which requires meeting graduation criteria for both degrees. A student advisor needs to know the probability a newly admitted student is interested in such a program, so that the student can be properly advised. A study of previous years finds that the probability a student gets a Bachelor of Science degree is P(Science)=0.3 and the probability a student gets a Bachelor of Arts degree is P(Arts)=0.6 . The study also shows that the probability a student gets no degree is P(no)=0.2 .A - The probability a student gets a Bachelor of Arts and Science degree is:a) 0.3.b) 0.6.c) 0.1.d) 0.2.B - The probability a student gets a Bachelor of Arts degree or a Bachelor of Science degree is:a)0.9.b) 0.3.c) 0.6.d) 0.8.C - The probability a student gets only a Bachelor of Arts degree is:a) 0.1.b) 0.5.c) 0.3.d) 0.6.

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general 9 months ago 5347

The desired percentage of SiO2 in a certain type of aluminous cement is 5.5. To test whether the true average percentage is 5.5 for a particular production facility, 16 independently obtained samples are analyzed. Suppose that the percentage of SiO2 in a sample is normally distributed with σ = 0.32 and that x = 5.24. (Use α = 0.05.) (a) Does this indicate conclusively that the true average percentage differs from 5.5?State the appropriate null and alternative hypotheses.H0: μ = 5.5Ha: μ > 5.5H0: μ = 5.5Ha: μ ≥ 5.5 H0: μ = 5.5Ha: μ < 5.5H0: μ = 5.5Ha: μ ≠ 5.5

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general 9 months ago 6245

Suppose that the mean value of interpupillary distance (the distance between the pupils of the left and right eyes) for adult males is 65 mm and that the population standard deviation is 5 mm. (a) If the distribution of interpupillary distance is normal and a random sample of n = 25 adult males is to be selected, what is the probability that the sample mean distance x for these 25 will be between 64 and 66 mm? (Round all your intermediate calculations to four decimal places. Round the answers to four decimal places.)

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general 9 months ago 1387