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The table shows the number satisfied in their work in a sample of working adults with a college education and in a sample of working adults without a college education. Assume that you plan to use a significance level of alpha=0.05 to test the claim that p1>p2. Find the critical value(s) for this hypothesis test. Do the data provide sufficient evidence that a greater proportion of those with a college education are satisfied in their work?
                                                    College Education      No college education     
Number in sample                                194                                  188                       
number satisfied in their work           74                                    70
The answer that I got was z=1.645;no.
A)z=1.645;no
B)z=-1.645;yes
C)z=1,96;yes
D)z=+-1.96;no
Assume that you plan to use a significance level of alpha=0.05 to test the claim that p1=p2. Use the given sample sizes and numbers of successes to find the z test statistic for the hypothesis test.
A report on the nightly news broadcast stated that 13 out of 103 households with pet dogs were burglarized and 23 out of 177 without pet dogs were burglarized.
Post Merge: 2 months ago

I got z=-0.090
Express the null hypothesis and the alternative null hypothesis in symbolic form. Use the correct symbol(mean, p, standard deviation) for the indicated parameter. An entomologist writes an article in a scientific journal which claims that fewer that 3 in ten thousand male fireflies are unable to produce light due to a genetic mutation. Use the parameter p, the true proportion of fireflies unable to produce light.
The claim is that the proportion of drowning deaths of children attributable to beaches is more than 0.25, and the sample statistics include n=575 drowning deaths of children with 30% of them attributable to beaches.
In a recent court case it was found that during a period of 11 years 873 people were selected for grand jury duty and 42​% of them were from the same ethnicity. Among the people eligible for grand jury​ duty, 78.7​% were of this ethnicity. Use a 0.01 significance level to test the claim that the selection process is biased against allowing this ethnicity to sit on the grand jury. Identify the null​ hypothesis, alternative​ hypothesis, test​ statistic, P-value, conclusion about the null​ hypothesis, and final conclusion that addresses the original claim. Use the​ P-value method and the normal distribution as an approximation to the binomial distribution.
Trials in an experiment with a polygraph include 96 results that include 24 cases of wrong results and 72 cases of correct results. Use a 0.01 significance level to test the claim that such polygraph results are correct less than 80​% of the time. Use the​ P-value method. Use the normal distribution as an approximation of the binomial distribution.
A genetic experiment involving peas yielded one sample of offspring consisting of 410 green peas and 147 yellow peas. Use a 0.05 significance level to test the claim that under the same​ circumstances, 24​% of offspring peas will be yellow. Use the​ P-value method and the normal distribution as an approximation to the binomial distribution.
A food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a major city. Construct a 95​% confidence interval estimate of the mean amount of mercury in the population. Does it appear that there is too much mercury in tuna​ sushi?
0.51, 0.75, 0.09, 0.87, 1.36, 0.57, 0.80
A 19.5 kg object moving in the +x direction at 5.5 m/s collides head-on with a 15.0 kg object moving in the −x direction at 4.5 m/s
A)Find the final velocity of each mass if the objects stick together.
Express your answers using two significant figures. Enter your answers numerically separated by a comma.
B)Find the final velocity of each mass if the collision is elastic.
Express your answers using two significant figures. Enter your answers numerically separated by a comma.
C) Find the final velocity of each mass if the 19.5 kg object is at rest after the collision.
Express your answers using two significant figures. Enter your answers numerically separated by a comma.
D)Is the result in part C "reasonable"? Explain.
E)Find the final velocity of each mass if the 15.0 kg object is at rest after the collision.
Express your answers using two significant figures. Enter your answers numerically separated by a comma.
F)Is the result in part E "reasonable"? Explain.
G)Find the final velocity of each mass if the 19.5 kg object has a velocity of 4.5 m/s in the −x direction after the collision.
Express your answers using two significant figures. Enter your answers numerically separated by a comma.
H)Is the result in part G "reasonable"? Explain.
Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Ball A is moving upward along the y axis at vA = 2.4 m/s , and ball B is moving to the right along the x axis with speed vB = 5.2 m/s . After the collision, assumed elastic, ball B is moving along the positive y axis.
What is the final direction of ball A? What are their two speeds?
A 6.8 cm diameter horizontal pipe gradually narrows to 5.2 cm . When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 33.0 kPa and 22.0 kPa , respectively.
How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 63 kg ? Do not neglect the weight of the logs. Assume the specific gravity of wood is 0.53.
A block (mass m1) lying on a frictionless inclined plane is connected to a mass m2 by a massless cord passing over a pulley, as shown in the figure. This is the additional part of the problem and the formula has to be in terms of m1, m2, θ and g.
What is the y component of a vector (in the xy plane) whose magnitude is 84.7 and whose x component is 72.8? This is the problem that I'm having trouble with.
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