A technician compares repair costs for two types of microwave ovens (type I and type II) He believes that the repair cost for type I ovens is greater than the repair cost for type Il ovens. A sample of 43 type I ovens has a mean repair cost of $70.15, with a standard deviation of $20.62. A sample of 57 type Il ovens has a mean repair cost of $65.36, with a standard deviation of $22.21. Conduct a hypothesis test of the technician's claim at the 0.05 level of significance. Let u, be the true mean repair cost for type I ovens and u, be the true mean repair cost for type Il ovens. Step 1 of 4: State the null and alternative hypotheses for the test. 画 Tables E Keypad Answer Keyboard Shortcuts Ho Hi *AV NV

A technician compares repair costs for two types of microwave ovens (type I and type II) He believes that the repair cost for type I ovens is greater than the repair cost for type Il ovens. A sample of 43 type I ovens has a mean repair cost of $70.15, with a standard deviation of $20.62. A sample of 57 type Il ovens has a mean repair cost of $65.36, with a standard deviation of $22.21. Conduct a hypothesis test of the technician's claim at the 0.05 level of significance. Let u, be the true mean repair cost for type I ovens and u, be the true mean repair cost for type Il ovens. Step 1 of 4: State the null and alternative hypotheses for the test. 画 Tables E Keypad Answer Keyboard Shortcuts Ho Hi *AV NV

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Description: CorrectIncorrectA technician compares repair costs for two types of microwave ovens (type l and type II). He believes that the repair cost for type I ovens is greater than the repair costfor type Il ovens. A sample of 43 type I ovens has a mean repa

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An industrial plant wants to determine which of two types of fuel, electric or gas, is more cost efficient (measured in cost per unit of energy). Independent random samples were taken of plants using electricity and plants using gas. These samples consisted of 7 plants using electricity, which had a mean cost per unit of $36.41 and standard deviation of $8.53, and 13 plants using gas, which had a mean of $46.50 and standard deviation of $8.60. Assume that the populations of costs per unit are normally distributed for each type of fuel, and assume that the variances of these populations are equal. Can we conclude, at the 0.10 level of significance, that u, the mean cost per unit for plants using electricity, differs from H,, the mean cost per unit for plants using gas? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.)…
A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for type l ovens is greater than the repair cost for type Il ovens. A sample of 62 type I ovens has a mean repair cost of $86.71, with a standard deviation of $11.53. A sample of 61 type Il ovens has a mean repair cost of $79.77, with a standard deviation of $13.41. Conduct a hypothesis test of the technician's claim at the 0.05 level of significance. Let , be the true mean repair cost for type l ovens and uz be the true mean repair cost for type l ovens. Step 3 of 4: Determine the decision rule for rejecting the null hypothesis Ho. Round the numerical portion of your answer to three decimal places. Answer E Tables E Keypad Keyboard Shortcuts Previous Step Answers Reject Ho if |2| Submit Answer © 2020 Hawkes Learning MacBook Air 80 器 88 DO esc FS ! & 1 2 3 4 5 6 7 8 9 delete { } Q E R Y P tab A S D G H J K L caps lock return > ? с V N M hift shift control option…
The America Automobile Association reported that the mean price of a gallon of regular grade gasoline in the United States in October 2020 was $2.82. An economist is interested in determining whether the mean price of regular grade gasoline is cheaper (less than) in New York State. To test this, the economist sample 50 gas stations in NY and find the mean price of regular grade gasoline to be $2.77. Assume the standard deviation for the price of regular grade gasoline is $0.15. Use the critical value method to perform a hypothesis test at the 0.05 level of significance. a. Define the parameter we are testing and setup a hypothesis test to see if the mean price of gas is cheaper in NY compared to the national mean: b. Calculate the test statistics for this hypothesis test. c.What is the critical value for this hypothesis test?
A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for type I ovens is greater than the repair cost for type II ovens. A sample of 34 type I ovens has a mean repair cost of $⁢70.86, with a standard deviation of $⁢12.35. A sample of 48 type II ovens has a mean repair cost of $⁢67.84, with a standard deviation of $⁢21.72. Conduct a hypothesis test of the technician's claim at the 0.10.1 level of significance. Let μ1 be the true mean repair cost for type I ovens and μ2 be the true mean repair cost for type II ovens. Step 2 of 4 : Compute the value of the test statistic. Round your answer to two decimal places.
An industrial plant wants to determine which of two types of fuel, electric or gas, is more cost efficient (measured in cost per unit of energy). Independent random samples were taken of plants using electricity and plants using gas. These samples consisted of 14 plants using electricity, which had a mean cost per unit of $55.06 and standard deviation of $8.25, and 12 plants using gas, which had a mean of $57.80 and standard deviation of $7.81. Assume that the populations of costs per unit are normally distributed for each type of fuel, and assume that the variances of these populations are equal. Can we conclude, at the 0.10 level of significance, that μ₁, the mean cost per unit for plants using electricity, differs from μ₂, the mean cost per unit for plants using gas? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of…
A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for type I ovens is greater than the repair cost for type Il ovens. A sample of 62 type l ovens has a mean repair cost of $86.71, with a standard deviation of $11.53. A sample of 61 type Il ovens has a mean repair cost of $79.77, with a standard deviation of $13.41. Conduct a hypothesis test of the technician's claim at the 0.05 level of significance. Let uj be the true mean repair cost for type I ovens and uz be the true mean repair cost for type Il ovens. Step 2 of 4: Compute the value of the test statistic. Round your answer to two decimal places. Answer O Tables E Keypad How to enter your answer Keyboard Shortcuts Previous Step Answers Submit Answer O 2020 Hawkes Learning MacBook Air 80 88 DI DD F1 F2 F4 F7 F8 F11 ! 23 $ & 1 2 3 4 + 7 8 9 Q W E R T Y U { [ A S D F H J K L C V B N M > ? otion command command option .. .-
A pharmaceutical company needs to know if its new cholesterol drug, Praxor, is effective at lowering cholesterol levels. It believes that people who take Praxor will average a greater decrease in cholesterol level than people taking a placebo. After the experiment is complete, the researchers find that the 4848 participants in the treatment group lowered their cholesterol levels by a mean of 21.521.5 points with a standard deviation of 2.52.5 points. The 4040 participants in the control group lowered their cholesterol levels by a mean of 20.920.9 points with a standard deviation of 4.14.1 points. Assume that the population variances are not equal and test the company’s claim at the 0.100.10 level. Let the treatment group be Population 1 and let the control group be Population 2. Step 2 of 3 : Compute the value of the test statistic. Round your answer to three decimal places. step 3 of 3 : Conclusion- fail to reject/reject...insufficient/sufficient
A study is done to determine which of two soft drinks has more sugar. There are 25 cans of Beverage A in the researchers' sample and 15 cans of Beverage B. The mean amount of sugar in Beverage A is 34.7 grams per can with a sample standard deviation of 0.7 grams. The mean amount of sugar in Beverage B is 33.9 grams with a standard deviation of 0.6 grams. The researchers believe that Beverage A has less sugar than Beverage B, on average. Both populations are normally distributed. Conduct a hypothesis test using a 2% level of significance. Step 1: State the null and alternative hypotheses. Ho:µA – µB 2V Ho:HA - HB V test.) (So we will be performing a left-tailed forum
A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for type I ovens is greater than the repair cost for type Il ovens. A sample of 60 type I ovens has a mean repair cost of $74.06, with a standard deviation of $16.10. A sample of 68 type Il ovens has a mean repair cost of $67.73, with a standard deviation of $14.70. Conduct a hypothesis test of the technician's claim at the 0.1 level of significance. Let u, be the true mean repair cost for type I ovens and u, be the true mean repair cost for type Il ovens. Step 1 of 4: State the null and alternative hypotheses for the test. Answer O Tables E Keypad Keyboard Shortcuts Submit Answer O 2020 Hawkes Learning E P Search for anything 812 AM 11/25/2020 hp brt se delete home end pg up 共 %24 4 2. 3 6 9 +] 8 + backspace num lock Q E R T Y 8. home G H K enter 4 pause V M t shift 2 end alt talt ctri ins
An industrial plant wants to determine which of two types of fuel, electric or gas, is more cost efficient (measured in cost per unit of energy). Independent random samples were taken of plants using electricity and plants using gas. These samples consisted of 7 plants using electricity, which had a mean cost per unit of $64.13 and standard deviation of $8.32, and 12 plants using gas, which had a mean of $60.30 and standard deviation of $8.52. Assume that the populations of costs per unit are normally distributed for each type of fuel, and assume that the variances of these populations are equal. Can we conclude, at the 0.10 level of significance, that u,, the mean cost per unit for plants using electricity, differs from u, the mean cost per unit for plants using gas? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.)…
A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for type I ovens is greater than the repair cost for type Il ovens. A sample of 58 type I ovens has a mean repair cost of $84.57, with a standard deviation of $12.03. A sample of 72 type |l ovens has a mean repair cost of $81.69, with a standard deviation of $11.91. Conduct a hypothesis test of the technician's claim at the 0.1 level of significance. Let u be the true mean repair cost for type I ovens and uz be the true mean repair cost for type II ovens. Step 3 of 4: Determine the decision rule for rejecting the null hypothesis Hg. Round the numerical portion of your answer to two decimal places. E Tables E Keypad Answer Keyboard Shortcuts Previous Step Answers Reject Ho if Tutor Skip Try Similar Submit Answer O 2020 Hawkes Learning MacBook Air esc 80 888 F3 F4 FS F10 F11 F12 ! $ & + 1 2 3 6 8. 9 delete W R Y U { tab [ A F H J K s lock returr C V control option…
Dentists believe that a diet low in sugary foods can reduce the number of cavities in children. Ten children whose diets are believed to be high in sugar are examined and the mean number of cavities is 3.63.6 with a standard deviation of 1.31.3. Twenty children whose diets are believed to be low in sugar are examined and the mean number of cavities is 1.01.0 with a standard deviation of 0.30.3. Construct a 99%99% confidence interval for the true difference between the mean numbers of cavities for children whose diets are high in sugar and those whose diets are low in sugar. Assume that the variances of the two populations are the same. Let Population 1 be children whose diets are believed to be high in sugar and Population 2 be children whose diets are believed to be low in sugar. Round the endpoints of the interval to one decimal place, if necessary.