Homework Answers
As we are testing here whether the population mean is less than 130, therefore this is a lower tailed test here. For 0.1 level of significance, as we dont have population standard deviation here, we use the t test here to perform the hypothesis test.
For n - 1 = 8 degrees of freedom, we have from t distribution
tables here:
P( t8 < -1.397) = 0.1
Therefore the rejection region here is given as:
Reject H0 if t < -1.397
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The output voltage for a certain electric circuit is specified to be 130. A sample study...
Show instructions Question 7 4 pts The output voltage for a certain electric circuit is specified...
Show instructions Question 7 4 pts The output voltage for a certain electric circuit is specified to be 130. A sample study of 9 independent reading on the voltage reading gave a sample mean 128.6 and a standard deviation of 3-2.1. Teat the hypothesis Ho: - 130 against the alternative hypothesis Ha: P < 130 at use a- 0.10. Assuming population distribution normal, what is the rejection region? Ot< -1.833 Ot< -1.397 O z< -1.28 O z< -2.821 - Previous
1. In lecture 23, we learnt an objective way of testing The goal of this quiz...
1. In lecture 23, we learnt an objective way of testing The goal of this quiz is to derive the testing for the less-than type alternative hypothesis o s. (a) Imitate the proof in Lecture 23 to construct a test at 5% level of significance starting from a general test statistic θ for testing the hypothesis in (1). You can have a similar asymptotic normality assumption. Be careful in getting the Z-cutoff to find the appropriate threshold for e rejection...
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Test the claim about the population mean, , at the given level of significance using the given sample statistics. Claim: u = 30; a = 0.09; 6 = 3.02. Sample statistics: x = 28.8, n=62 Identify the null and alternative hypotheses. Choose the correct answer below. O A. Ho: u = 30 Hu> 30 0 C. Ho: < 30 Hau= 30 E. Ho: u = 30 H: #30 OB. Ho:u#30 Ha: u = 30 OD. Ho: > 30 Ha: H...
the bottom three are the same question ^ ^ ^ Find the probability and interpret the...
the bottom three are the same question
^
^
^
Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $64,500. A random sample of 44 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $62,000? Assume o = $6.200 The probability that the mean salary of the sample is less than $62,000...
3. The table to the right shows the cost per ounce (in dollars) for a random...
3. The table to the right shows the cost per ounce (in dollars) for a random sample of toothpastes exhibiting very good stain removal, goad stain removal, and fair stain removal. At α= 0.01, can you conclude that the mean costs per ounce are different? Perform a one-way ANOVA test by completing parts a through d. Assume that each sample is drawn from a normal population, that the samples are independent of each other, and that the populations have the...
Show instructions Question 7 4 pts The output voltage for a certain electric circuit is specified to be 130. A sample study of 9 independent reading on the voltage reading gave a sample mean 128.6 and a standard deviation of 3-2.1. Teat the hypothesis Ho: - 130 against the alternative hypothesis Ha: P < 130 at use a- 0.10. Assuming population distribution normal, what is the rejection region? Ot< -1.833 Ot< -1.397 O z< -1.28 O z< -2.821 - Previous
1. In lecture 23, we learnt an objective way of testing The goal of this quiz is to derive the testing for the less-than type alternative hypothesis o s. (a) Imitate the proof in Lecture 23 to construct a test at 5% level of significance starting from a general test statistic θ for testing the hypothesis in (1). You can have a similar asymptotic normality assumption. Be careful in getting the Z-cutoff to find the appropriate threshold for e rejection...
A company claims that the mean monthly residential electricity consumption in a certain region is more than 890 kilowatt-hours (kWh). You want to test this claim. You find that a random sample of 64 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 121 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and Ha. Choose the correct answer below. O B. Ho u...
A sample of 12 radon detectors of a certain type was selected, and each was exposed to 100 pcI/L of radon. The resulting readings were as follows: 105.5 91.4 100.1 91.7 97.0 91.8 97.4 92.9 108.2 100.6 103.8 106.1 in USE SALT (a) Does this data suggest that the population mean reading under these conditions differs from 100? (Use a = 0.05.) State the appropriate null and alternative hypotheses. Ho: 4 = 100 Haul + 100 Ho: 4 = 100...
The sample of six measurements shown below was randomly selected from a normally distributed population. Complete parts a throughc 1,3, 1, 5, 1,2 a. Test the null hypothesis that the mean of the population is 3 against the alternative hypothesis, 3. Use a 0.10. If a = 0.10, find the rejection region for the test. Choose the correct answer below O A. t 2.015 or t> 2.015 O C. t-2015 O E. t1476 O B. t-1.476 O D. t 1.476...
7.1.37 Question Help A security expert claims that more than 15% of all homeowners have a home security alarm. State Ho and H, in words and in symbols. Then determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed. Explain your reasoning State the null hypothesis in words and in symbols. Choose the correct answer below. O A. The null hypothesis expressed in words is, "the proportion of all homeowners who own a home security alarm is...
Test the claim about the population mean, , at the given level of significance using the given sample statistics. Claim: u = 30; a = 0.09; 6 = 3.02. Sample statistics: x = 28.8, n=62 Identify the null and alternative hypotheses. Choose the correct answer below. O A. Ho: u = 30 Hu> 30 0 C. Ho: < 30 Hau= 30 E. Ho: u = 30 H: #30 OB. Ho:u#30 Ha: u = 30 OD. Ho: > 30 Ha: H...
the bottom three are the same question
^
^
^
Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $64,500. A random sample of 44 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $62,000? Assume o = $6.200 The probability that the mean salary of the sample is less than $62,000...
3. The table to the right shows the cost per ounce (in dollars) for a random sample of toothpastes exhibiting very good stain removal, goad stain removal, and fair stain removal. At α= 0.01, can you conclude that the mean costs per ounce are different? Perform a one-way ANOVA test by completing parts a through d. Assume that each sample is drawn from a normal population, that the samples are independent of each other, and that the populations have the...
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