Question

In: Statistics and Probability

A company produces electric devices operated by a thermostatic control. The standard deviation of the temperature...

A company produces electric devices operated by a thermostatic control. The standard deviation of the temperature where the controls operate should not exceed 2.0 degrees Fahrenheit. For a random sample of 20 of these controls, the sample standard deviation of operating temperatures was 2.36 degrees Fahrenheit.

i) Stating any necessary assumptions, test, at the 5% level, the null hypothesis that the population standard deviation is 2.0 against the alternative that it is larger.

ii) Create a 90% confidence interval for the population variance.

Solutions

Expert Solution

i)

ii)

orchestra answered 2 years ago
Next > < Previous

Related Solutions

A company produces electric devices operated by a thermostatic control. The standard deviation of the temperature...
A company produces electric devices operated by a thermostatic control. The standard deviation of the temperature where the controls operate should not exceed 2.0 degrees Fahrenheit. For a random sample of 20 of these controls, the sample standard deviation of operating temperatures was 2.36 degrees Fahrenheit. i) Stating any necessary assumptions, test, at the 5% level, the null hypothesis that the population standard deviation is 2.0 against the alternative that it is larger. ii) Create a 90% confidence interval for...
A process that is in control has a mean of 12.5 and a standard deviation of...
A process that is in control has a mean of 12.5 and a standard deviation of .4 a. Construct an control chart if samples of size are to be used (to 1 decimal). For n=4 Find the ucl Find the lcl b. Repeat part (a) for samples of size 6 and 13 (to 2 decimals). For n-6 Find the ucl Find the lcl For n=13 Find the ucl find the lcl Find the c. What happens to the limits of...
HiTech Products manufactures three types of remote-control devices: Economy, Standard, and Deluxe. The company, which uses...
HiTech Products manufactures three types of remote-control devices: Economy, Standard, and Deluxe. The company, which uses activity-based costing, has identified five activities (and related cost drivers). Each activity, its budgeted cost, and related cost driver is identified below Activity Cost Material Handling $225,000 Material Insertion $2,475,000 Automated machinery $840,000 Finishing $170,000 Packaging $170,000 The following information pertains to the three product lines for next year: Economy Standard Deluxe   Unit 2 be prod. 10,000 5,000 2,000 Order 2 ship 1,000 500...
HiTech Products manufactures three types of remote-control devices: Economy, Standard, and Deluxe. The company, which uses...
HiTech Products manufactures three types of remote-control devices: Economy, Standard, and Deluxe. The company, which uses activity-based costing, has identified five activities (and related cost drivers). Each activity, its budgeted cost, and related cost driver is identified below. Activity Cost Cost Driver   Material handling $269,000      Number of parts   Material insertion 3,390,000      Number of parts   Automated machinery 872,000      Machine hours   Finishing 256,000      Direct labor hours   Packaging 256,000      Orders shipped             Total $5,043,000           ...
Barnett Products manufactures three types of remote-control devices: Economy, Standard, and Deluxe.
Barnett Products manufactures three types of remote-control devices: Economy, Standard, and Deluxe. The company, which uses activity-based costing, has identified five activities (and related cost drivers). Each activity, Its budgeted cost and related cost driver is identified below.  The following information pertains to the three product lines for next year: What is Barnett's pool rate for the material-insertion activity?
The body temperature of adults is normally distributed with a mean of 98.6°F and standard deviation...
The body temperature of adults is normally distributed with a mean of 98.6°F and standard deviation of 0.60°F. Suppose 36 adults are randomly selected, what is the probability that their mean body temperature is less than 98.0°F?
Question 5 Consider the population of electric usage per month for houses. The standard deviation of...
Question 5 Consider the population of electric usage per month for houses. The standard deviation of this population is 119 kilowatt-hours. What is the smallest sample size to provide a 90% confidence interval for the population mean with a margin of error of 32 or less?
A biotechnology company produces a therapeutic drug whose concentration has a standard deviation of 0.004 g/l....
A biotechnology company produces a therapeutic drug whose concentration has a standard deviation of 0.004 g/l. A new method of producing this drug has been proposed, although some additional cost is involved. Management will authorize a change in production technique only if the standard deviation of the concentration in the new process is less than 0.004 g/l. The researchers randomly chose 10 specimens and obtained the data found below. Assume the population of interest is normally distributed. A. Test the...
A factory produces plate glass with a mean thickness of 4mm and a standard deviation of...
A factory produces plate glass with a mean thickness of 4mm and a standard deviation of 1.1mm. A simple random sample of 100 sheets of glass is to be measured, and the mean thickness of the 100 sheets is to be computed. What is the probability that the average thickness of the 100 sheets is less than 3.91 mm?
CONTROL LIMITS, VARIANCE INVESTIGATION Goodsmell Company produces a well-known cologne. The standard manufacturing cost of the...
CONTROL LIMITS, VARIANCE INVESTIGATION Goodsmell Company produces a well-known cologne. The standard manufacturing cost of the cologne is described by the following standard cost sheet: Direct materials: Liquids (4.2 decilitres @ $0.25)     $1.05 Bottles (1 @ $0.05)                          0.05 Direct labour (0.2 hr. @ $12.50)                2.50 Variable overhead (0.2 hr. @ $4.70)        0.94 Fixed overhead (0.2 hr. @ $1.00)             0.20 Standard cost per unit                                $4.74 Management has decided to investigate only those variances that exceed the lesser of 10 percent of...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT