the average length of time for students to register for classes at a certain college has been 110 minutes. a new registration procedure using modern computing machines is being tried. if a random sample of 20 students had an average registration time of 90 minutes with a standard deviation of 14.5 minutes under the new system, test the hypothesis that the population mean is now less than 110 using 0.05 level of significance. assume the population of times to be normal.
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- The U.S. Energy Information Administration claimed that U.S. residential customers used an average of 10,798 kilowatt hours (kWh) of electricity this year. A local power company believes that residents in their area use more electricity on average than EIA's reported average. To test their claim, the company chooses a random sample of 164of their customers and calculates that these customers used an average of 11,215kWh of electricity last year. Assuming that the population standard deviation is 2749kWh is there sufficient evidence to support the power company's claim at the 0.01 level of significance?The U.S. Energy Information Administration claimed that U.S. residential customers used an average of 10,817 kilowatt hours (kWh) of electricity this year. A local power company believes that residents in their area use more electricity on average than EIA's reported average. To test their claim, the company chooses a random sample of 174 of their customers and calculates that these customers used an average of 11,156kWh of electricity last year. Assuming that the population standard deviation is 1913kWh, is there sufficient evidence to support the power company's claim at the 0.05 level of significance. Step 1 of 3 : State the null and alternative hypotheses for the test. Choose one option below H0: μ=10,817 HA: μ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯10,817 A.≠ B.< C.> Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.An electronics manufacturing process has a scheduled mean completion time of 75 minutes. It is claimed that, under new management, the mean completion time, μ, is less than 75 minutes. To test this claim, a random sample of 21 completion times under new management was taken.The sample had a mean completion time of 69 minutes and a standard deviation of 12 minutes. Assume that the population of completion times under new management is normally distributed. At the 0.05 level of significance, can it be concluded that the mean completion time, μ, under new management is less than the scheduled mean?Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. The null hypothesis: H0: The alternative hypothesis: H1: The type of test statistic: (Choose one) Z t Chisquare F The value of the test statistic:(Round to at least three…
- An electronics manufacturing process has a scheduled mean completion time of 75 minutes. It is claimed that, under new management, the mean completion time, μ , is less than 75 minutes. To test this claim, a random sample of 11 completion times under new management was taken. The sample had a mean completion time of 73 minutes and a standard deviation of 11 minutes. Assume that the population of completion times under new management is normally distributed. At the 0.05 level of significance, can it be concluded that the mean completion time, μ , under new management is less than the scheduled mean? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. The null hypothesis: H0: The alternative hypothesis: H1: The type of test statistic: (Choose one)ZtChi squareF The value of the test…An electronics manufacturing process has a scheduled mean completion time of 70 minutes. It is claimed that, under new management, the mean completion time, µ, is less than 70 minutes. To test this claim, a random sample of 10 completion times under new management was taken. The sample had a mean completion time of 67 minutes and a standard deviation of 11 minutes. Assume that the population of completion times under new management is normally distributed. At the 0.1 level of significance, can it be concluded that the mean completion time, µ, under new management is less than the scheduled mean? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. The null hypothesis: H0: ____ The alternative hypothesis: H1:_____ The type of test statistic: (Choose one) ____ The value of the test statistic: ________ (round to at least three decimal places.) The critical value at…The U.S. Energy Information Administration claimed that U.S. residential customers used an average of 10,368 kilowatt hours (kWh) of electricity this year. A local power company believes that residents in their area use more electricity on average than EIA's reported average. To test their claim, the company chooses a random sample of 128 of their customers and calculates that these customers used an average of 10,745kWh of electricity last year. Assuming that the population standard deviation is 2198kWh, is there sufficient evidence to support the power company's claim at the 0.05 level of significance? Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.
- The U.S. Energy Information Administration claimed that U.S. residential customers used an average of 10,368 kilowatt hours (kWh) of electricity this year. A local power company believes that residents in their area use more electricity on average than EIA's reported average. To test their claim, the company chooses a random sample of 128 of their customers and calculates that these customers used an average of 10,745 kWh of electricity last year. Assuming that the population standard deviation is 2198 kWh, is there sufficient evidence to support the power company's claim at the 0.05 level of significance? Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.An electronics manufacturing process has a scheduled mean completion time of 65 minutes. It is claimed that, under new management, the mean completion time, μ, is less than 65 minutes. To test this claim, a random sample of 20 completion times under new management was taken. The sample had a mean completion time of 59 minutes and a standard deviation of 12 minutes. Assume that the population of completion times under new management is normally distributed. At the 0.05 level of significance, can it be concluded that the mean completion time, μ, under new management is less than the scheduled mean? State the null hypothesis H0 and the alternative hypothesis H1 Using the t-test find the value Find the critical value At the 0.05 level, can it be concluded that the mean completion time under new management is less than the scheduled mean? Yes or No?An electronics manufacturing process has a scheduled mean completion time of 70 minutes. It is claimed that, under new management, the mean completion time, μ , is less than 70 minutes. To test this claim, a random sample of 20 completion times under new management was taken. The sample had a mean completion time of 65 minutes and a standard deviation of 10 minutes. Assume that the population of completion times under new management is normally distributed. At the 0.05 level of significance, can it be concluded that the mean completion time, μ , under new management is less than the scheduled mean? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table.