Category: Uncategorized

Which instruments will be used on a thyroidectomy procedure?

The following dataset shows the value of a Honda Accord based on the age of the car. Age of Car Value of Car 4 12500 5 10900 2 15750 12 4000 9 8000 11 6000 7 9200 5 10600 13 3700   a) Find the correlation coefficient (round to 3 decimal places) [correlation] b) Find the regression equation which relates the value of a Honda Accord to its age (round to 1 decimal place) [equation] b) Predict the value of a 10 year old Honda Accord (round to nearest whole number). [prediction]

A safety engineer is testing the claim that the mean braking distances of two types of tires is different from each other The engineer collects sample data as follows:Tire A:  Sample size of 35 tires: Mean braking distance = 45.1 feet, standard deviation = 4.7 feetTire B:  Sample size of 40 tires: Mean braking distance = 47.2 feet, standard deviation = 4.1 feet Test the claim at the 10% significance level. a) Find the p-value for this hypothesis test. [pvalue]b) Come to a decision for the claim that the mean breaking distance is different for the two tires [decision]

You ask 15 random people if their favorite football team is the Philadelphia Eagles. From past data, it’s known that 70% of people consider the Philadelphia Eagles to be their favorite football team. (a) What is the mean number of people that consider the Philadelphia Eagles to be their favorite football team. [mean] (b) What is the standard deviation of people that consider the Philadelphia Eagles to be their favorite football team. [stddev] Round your answers to 1 decimal place.  

Proto-oncogenes are normal genes with the potential to become oncogenes.  Which of the following statements regarding oncogenes is false?

From previous studies, it is concluded that 75% of workers got their job through newspaper ads. A researcher claims this percentage has increased and decides to survey 100 adults. After surveying the 100 adults, the researcher finds that 79 workers got their jobs through newspaper ads. Test the researcher’s claim at the 5%  significance level.  a) Find the p-value [pvalue]b) State your decision [decision]

The dean at a university states that the average GPA of students is less than 3.2 You decide to survey 120 students and from this sample you calculate the mean GPA is 3.14 and the standard deviation is 0.35 Test the dean’s claim at the 5% significance level.  a) Find the p-value [pvalue]b) Is there enough evidence to support the dean’s claim, or is there not enough evidence to support the dean’s claim. [decision]

The following table shows data collected for hours spent online and test scores for various students.    Hours spent online (x) Test Score (y) 0 96 1 85 2 82 3 74 3 90 5 81 5 83 7 75 10 50 (a) Find the sample correlation coefficient (r) for this dataset [corr] (b) Determine if the correlation is significant, or not significant (use a significance level of 0.05) [sign]  

Three different diet plans are to be tested for mean weight loss.  Results are shown below (data represents weight loss in pounds for the participants in the study). The claim is that at least one mean is different from the others among the three plans. Using a level of significance of 0.05, test the claim. (a) Determine the p-value [pvalue] (b) Come to a conclusion [concl] Diet Plan #1 Diet Plan #2 Diet Plan #3 4 10 5.5 7.5 5.5 6.5 3.5 12.5 2 12 16 6 6 1.5 7

You decide to order 22 pizzas from Pizza Hut and record the delivery times. For the sample of 22 pizzas, the average delivery time turns out to be 29 minutes with a sample standard deviation of 2.5 minutes. What is the margin of error, E (round your answer to 3 decimal places) [moe] What is a 90% confidence interval for the true mean delivery time for Pizza Hut (round your answer to 3 decimal places) [conf]