Question 2
Young and Company claims that its pressurized diving bell will, on average, maintain its integrity to depths of 2500 feet or more. You take a random sample of 50 of the bells. The average maximum depth for bells in your sample is 2455 feet. Set up an appropriate hypothesis test using Young and Company’s claim as the null hypothesis. Assume the population standard deviation is 200 feet. Use a 1% significance level.
a) What is the p-value that you calculate for this sample?
b) Can you reject the company's claim at the 1% level?
Question 2 Young and Company claims that its pressurized diving bell will, on average, maintain its...
2. A manufacturer of transistors claims that its transistors will last an average of 1000 hours. To maintain this claim, 25 resistors are tested each month. What conclusions can you draw from a sample that has a mean of 1010 and a standard deviation of 60? You may assume that the distribution of the lifetime of a transistor is normal [NOTE: To receive FULL CREDIT, you must conduct a COMPLETE hypothesis test and make your conclusions using BOTH a fixed...
A manufacturer claims that the calling range (in feet) of its 900-MHz cordless telephone is greater than that of its leading competitor. A sample of 18 phones from the manufacturer had a mean range of 1120 feet with a standard deviation of 20 feet. A sample of 13 similar phones from its competitor had a mean range of 1110 feet with a standard deviation of 25 feet. Do the results support the manufacturer's claim? Let u be the true mean...
A cereal company claims that the mean weight of the cereal in its packets is more than 14 oz. The weights (in oz) of the cereal in a random sample of 8 cereal packets are listed below. You may assume the sample data comes from a population that follows a normal distribution. Using a 0.05 significance level, test the companies claim. State the null hypothesis H0. State the alternative hypothesis H1. What is the test statistic? State the alpha level....
A company claims that their lightbulbs last an average of 400 days. To test this claim, a random sample of 25 lightbulbs is tested and it is observed that they last for an average of 380 days with a standard deviation of 60 days. Part A) Assuming that the population of the time to failure of all lightbulbs is normally distributed, test the null hypothesis that the average life-length of their lightbulb is 400 days against the alternative that it...
2. One Sample t-test for Population Mean A vendor claims that the average weight of a shipment of parts is 1.84. The customer randomly chooses 64 parts and finds the sample has an average of 1.88 and standard deviation of 0.03. Should the customer reject the lot? Assume the customer wants to be 95% confident that the supplier's claim is incorrect before he rejects. (This is the same as the last example, except that 0.03 is the sample standard deviation...
Question 3 A consumer advocate group claims the average American household spends more than $874 during Christmas. The claim is tested with a sample of 64 households and finds the average of the sample to be $905 with a standard deviation of $125. Level of significance is 0.05. Answer the following: a) write Ho and Ha and identify which is the claim b) identify whether its left, right or two tailed c) write the p-value d) decide whether to reject...
2. The owner of a minor league football team claims that the average attendance at games is over 523, and he is therefore justified in moving the team to a city with a larger stadium. Assume that a hypothesis test of the claim has been conducted and that the conclusion is to reject H0 at a strong significance level. Which of the following is true? a. Sample data suggests that the alternative claim is true. b. Sample data proves that...
An auto manufacturer claims that the average length of time that one of its cars is owned before it requires a major repair is at least seven years. Assume that a survey of ten owners of the manufacture's cars finds that they went an average of 6 years before a major repair and the sample standard deviation for such time lengths was 1.8 years. Use the data to test the manufacture's claim at a 5% significance level. A. Give the...
A manufacturer claims that the calling range (in feet) of its 900-MHz cordless telephone is greater than that of its leading competitor. A sample of 99 phones from the manufacturer had a mean range of 13501350 feet with a standard deviation of 4242 feet. A sample of 1717 similar phones from its competitor had a mean range of 12801280 feet with a standard deviation of 2828 feet. Do the results support the manufacturer's claim? Let μ1μ1 be the true mean...
Need step 3 only.
A manufacturer claims that the calling range (in feet) of its 900 MHz cordless telephone is greater than that of its leading competitor. A sample of 15 phones from the manufacturer had a mean range of 1280 feet with a standard deviation of 21 feet. A sample of 10 similar phones from its competitor had a mean range of 1230 feet with a standard deviation of 40 feet. Do the results support the manufacturer's claim? Let...