One thousand cars were stopped at random for a roadside test of tyres and lights: 115...

One thousand cars were stopped at random for a roadside test of tyres and lights: 115 had unroadworthy tyres; and 46 had a lighting fault. These figures include 22 cars with both defects. If drivers had been fined $100 if their car had one defect, and $500 if their car had both defects, how much revenue would have been raised per car?

Expert Solution

milcah answered 1 year ago

In a random sample of 115 trombone players, 13 were female. Construct a 99% confidence interval...

In a random sample of 115 trombone players, 13 were female. Construct a 99% confidence interval for the proportion of trombone players that are female.

One hundred students were given an Algebra test. A random sample of ten students was taken...

One hundred students were given an Algebra test. A random sample of ten students was taken out of class of 800 enrolled students. The time it took each student to complete the test is recorded below. 22.2, 23.7, 16.8, 18.3, 19.7, 16.9, 17.2, 18.5, 21.0, and 19.7 a. Find the mean, variance and standard deviation for this sample of ten students b. Construct a 95% confidence interval for the population mean time to complete this Algebra test. c. Test if...

Thailand is one of the most popular locations for Chinese tourists. There were about 70 thousand...

Thailand is one of the most popular locations for Chinese tourists. There were about 70 thousand Chinese tourists visited Thailand every year. The competition among Thai tourist agents is very fierce. Some agents continue to cut their prices until the price is zero. This phenomenon is called “zero-dollar tour package”. At the same time there often news reports that many tourist agents often take the tourists to fake jewelry shops. Use the theory about market failure to explain this zero-dollar...

Do heavier cars really use more gasoline? Suppose 5 cars were chosen at random. Let x...

Do heavier cars really use more gasoline? Suppose 5 cars were chosen at random. Let x be the weight of the car (in hundreds of pounds) and y be gas mileage (in miles per gallon). X- 34,46,33,47,23 y- 17,29,23,28,21 - What is the value of the correlation coefficient? Based on the correlation coefficient, as the weight of the car increases, does the gas mileage tend to increase or decrease? -Find the equation of the least-squares regression line. -What percentage of...

29) Random samples of four different models of cars were selected and the gas mileage of...

29) Random samples of four different models of cars were selected and the gas mileage of each car was measured. The results are shown below. Model A / Model B / Model C / Model D 26 / 27 / 20 / 28 30 / 23 / 25 / 27 25 / 26 / 25 / 21 25 / 22 / 26 / 26 Test the claim that the four different models have the same population mean. Use a significance...

One thousand bases of quail mitochondrial DNA were downloaded to Geneious from the GenBank database. PCR...

One thousand bases of quail mitochondrial DNA were downloaded to Geneious from the GenBank database. PCR primers were designed to amplify a conserved region from this sequence. Each primer was 20 bases long, and the 5` end of the forward primer (F) and reverse primer (R) starts from base position 33 and 865, respectively. A PCR master mixture for 23 reactions to analyse different bird samples was prepared. Fill in the necessary information for the master mix in the following...

A random sample 11 student cars (group 1) were found to have ages with a mean...

A random sample 11 student cars (group 1) were found to have ages with a mean of 7 years and a standard deviation of 3.4 years, while second, independent random sample of 10 faculty cars (group 2) were found to have ages with a mean of 5.2 years and a standard deviation of 3.5 years. You may assume that car ages for both groups are approximately normally distributed and that the two population variances are equal. 1. Use a 0.01...

Researchers examined the relationship between cola consumption and bone loss after fifty. One thousand women were...

Researchers examined the relationship between cola consumption and bone loss after fifty. One thousand women were randomly sampled, everyone's cola consumption was recorded over a two month period of time, and bone density measures were also recorded. Researchers found that the more cola consumed, the lower the level of bone density. They concluded that cola consumption leads to loss of bone density. What type of study is this research and why? Identify the variables. Evaluation the internal validity. Researchers examined...

In a random sample of 100 college students, scores on a test were normally distributed with...

In a random sample of 100 college students, scores on a test were normally distributed with a mean of 80 points and standard deviation of 12 points. Use this scenario to answer the following questions: A. In this scenario, what is the point estimate? [2 points] B. Construct a 95% confidence interval to estimate the mean score in the population of all college students. Remember to show all work. Round your final answer to 3 decimal places. [4 points] C....

Task 4: Perform and document a one-sample hypothesis test to evaluate the claim "past cars have...

Task 4: Perform and document a one-sample hypothesis test to evaluate the claim "past cars have a lower average MPG than present cars." Utilize the information provided by the team analyzing the modern cars data ( the average MPG of modern cars is 24.58) to perform this test. Document all seven of the hypothesis testing steps. MPG mu-null= 24.58 t-data= -2.57 T-crit= 1.65 Task 5: Perform and document a one-sample hypothesis test to evaluate the claim "Past cars have a...

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