Question

In San Jose a sample of 73 mail carriers showed that 30 had been bitten by...

In San Jose a sample of 73 mail carriers showed that 30 had been bitten by an animal during one week. In San Francisco in a sample of 80 mail carriers, 16 had received animal bites. Is there a significant difference in the proportions? Use a 0.05. Find the 95% confidence interval for the difference of the two proportions.

Sellect all correct statements below based on the data given in this problem.


A) .0681 ? ?1 - ?2 ? .3539
B) .0681 ? p1 - p2 ? .3539
C) -.0681 ? p1 - p2 ? -.3539
D) The rate of mail carriers being bitten in San Jose is statistically less than the rate San Francisco at ? = 5%
E) The rate of mail carriers being bitten in San Jose is statistically greater than the rate San Francisco at ? = 5%

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A simple random sample of 100 flights of a large airline (call this airline 1) showed...
A simple random sample of 100 flights of a large airline (call this airline 1) showed that 64 were on time. A simple random sample of 100 flights of another large airline (call this airline 2) showed that 80 were on time. Let p1 and p2 be the proportion of all flights that are on time for these two airlines. If the 90% confidence interval for the difference p1 – p2 is –0.157 ± 0.102. Is there evidence of a...
A simple random sample of 100 flights of a large airline (Airline A), showed that 80...
A simple random sample of 100 flights of a large airline (Airline A), showed that 80 were on time. A simple random sample of 100 flights of another large airline (Airline B) showed that 64 were on time. Let p1 and p2 be the proportion of all flights that are on time for airline A and airline B, respectively. Is there evidence of a significant difference in the on-time rate for the two airlines? To determine this, test the appropriate...
A study is made of residents in Phoenix and its suburbs concerning the proportion of residents...
A study is made of residents in Phoenix and its suburbs concerning the proportion of residents who subscribe to Sporting News. A random sample of n1 = 90 urban residents showed that r1 = 10 subscribed, and a random sample of n2 = 99 suburban residents showed that r2 = 18 subscribed. Does this indicate that a higher proportion of suburban residents subscribe to Sporting News? Use a 5% level of significance. What are we testing in this problem? single...
5. In a random sample of 500 people in their 30's, 22% were smokers. In a...
5. In a random sample of 500 people in their 30's, 22% were smokers. In a random sample of 450 people in their 20's, 14% were smokers. The 95% confidence interval for the difference between the population proportions P20's - P30's. turned out to be: -0.128 < p1 - p2 < -0.032. What does this imply? There is not a significant difference between the smoking habits of people in their 20's and people in their 30's, but the sample showed...
From public records, individuals were identified as having been charged with drunken driving not less than...
From public records, individuals were identified as having been charged with drunken driving not less than 6 months or more than 12 months from the starting date of the study. Two random samples from this group were studied. In the first sample of 30 individuals, the respondents were asked in a face-to-face interview if they had been charged with drunken driving in the last 12 months. Of these 30 people interviewed face to face, 16 answered the question accurately. The...
Isabel Myers was a pioneer in the study of personality types. In a random sample of...
Isabel Myers was a pioneer in the study of personality types. In a random sample of 519 judges, it was found that 285 were introverts. Do the data indicate that a majority of judges are introverts? Use a = 0.05. State the null and alternate Do runners have lower heart rates, on average? Assume that non-runners have an average heart rate of 72 beats per minute. 1 State the null and alternate hypotheses. What is the level of significance? 2....
Question 7 It has been observed that some persons who suffer renal failure, again suffer renal...
Question 7 It has been observed that some persons who suffer renal failure, again suffer renal failure within one year of the first episode. This is due, in part, to damage from the first episode. The performance of a new drug designed to prevent a second episode is to be tested for its effectiveness in preventing a second episode. In order to do this two groups of people suffering a first episode are selected. There are 45 people in the...
1) Migraine and Acupuncture: A migraine is a particularly painful type of headache, which patients sometimes...
1) Migraine and Acupuncture: A migraine is a particularly painful type of headache, which patients sometimes wish to treat with acupuncture. To determine whether acupuncture relieves migraine pain, researchers conducted a randomized controlled study where 164 patients diagnosed with migraine headaches were randomly assigned to one of two groups: treatment or control. 75 patients in the treatment group received acupuncture that is specifically designed to treat migraines. 89 patients in the control group received placebo acupuncture (needle insertion at non-acupoint...
A cohort study is conducted to assess the effectiveness of a 4-week weight-loss intervention program among...
A cohort study is conducted to assess the effectiveness of a 4-week weight-loss intervention program among overweight men. Sixty participants were randomized into two groups. Group 1 worked with a personal trainer to come up with a physical activity regimen that would best fit their lifestyle, while Group 2 worked with a dietician to co-design a diet program to which the men would most likely adhere. Mean BMI was assessed for each group at the end of the 4 weeks....
1. For a pair of sample x- and y-values, what is the difference between the observed...
1. For a pair of sample x- and y-values, what is the difference between the observed value of y and the predicted value of y? a) An outlier b) The explanatory variable c) A residual d) The response variable 2. Which of the following statements is false: a) The correlation coefficient is unitless. b) A correlation coefficient of 0.62 suggests a stronger correlation than a correlation coefficient of -0.82. c) The correlation coefficient, r, is always between -1 and 1....
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT