Reference no: EM13243097
A problem with a telephone line that prevents a customer from receiving or making calls is disconcerting to both the customer and the telephone company. The data in the file PHONE represent samples of 20 problems reportedto two different offices of a telephone company and the timeto clear these problems (in minutes) from the customerslines:
Central Office I Time to Clear Problems (minutes)
1.48 1.75 0.78 2.85 0.52 1.60 4.15 3.97 1.48 3.10
1.02 0.53 0.93 1.60 0.80 1.05 6.32 3.93 5.45 0.97
Central Office II Time to Clear Problems (minutes)
7.55 3.75 0.10 1.10 0.60 0.52 3.30 2.10 0.58 4.02
3.75 0.65 1.92 0.60 1.53 4.23 0.08 1.48 1.65 0.72
a. Assuming that the population variances from both offices are equal, is there evidence of a difference in the mean waiting time between the two offices? (Use α=0.05 .)
b. Find the p-value in (a) and interpret its meaning.
c. What other assumption is necessary in (a)?
d. Assuming that the population variances from both offices are equal, construct and interpret a 95% confidence interval estimate of the difference between the population means in the two offices.
State what was the concentration in mol l original solution
: What was the concentration, in mol/L and mg/L, of Cu^2+ and Zn^2+ in the original solution? If the solution was prepared by dissolution of 0.654 g of brass in 250.00 mL solution, what the percentage of copper and zinc in the original sample of bra..
|
Prophetic device to predict the prosperity of rome
: In what way does Aeneas provide for his people? Is this a prophetic device to predict the prosperity of Rome?
|
Find the tensions in the rope to the left
: A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 521 N. As the drawing shows, Find the tensions in the rope to the left and to the right of the mountain climber
|
What role is played by the deities in the aeneid
: What role is played by the deities in the Aeneid? Do they personify external or internal human forces? By what means?
|
Difference between the population means in the two offices
: Find the p-value in and interpret its meaning and what other assumption is necessary - construct and interpret a 95% confidence interval estimate of the difference between the population
|
Explain charles''s law to calculate the volume of the gas
: A fixed amount of gas at 25.0 °C occupies a volume of 9.23 L when the pressure is 629 torr. Use Charles's law to calculate the volume (L) the gas will occupy when the temperature is increased to 121 °C while maintaining the pressure at 629 torr.
|
Discuss the major military operations-battles and campaign
: Discuss the major military operations, battles, and campaigns - land, sea, and air - of the Spanish-American War.
|
What is the sound intensity level
: A concert loudspeaker suspended high off the ground emits 32W of sound power, What is the sound intensity level at the position of the microphone
|
Indian empire of the mauryan dynasty
: What did it mean to be a good citizen in Ancient Greece, The Roman Empire, The Chinese Empire "Qin Dynasty", and The Indian Empire of the Mauryan Dynasty?
|