A consumer group was interested in comparing the operating time of cordless toothbrushes manufactured by two different companies. Group members took a random sample of 18 toothbrushes from Company A and 15 from Company B. Each was charged overnight and the number of hours of use before needing to be recharged was recorded. Company A toothbrushes operated for an average of 119.7 hours with a standard deviation of 1.74 hours; Company B toothbrushes operated for an average of 120.6 hours with a standard deviation of 1.72 hours.1. which of the following statements is true?A. This is a one tailed test of two dependent samplesB. This is a two tailed test of two independent samplesC. This is a one tailed test of two independent samplesD. These samples are matchedE. None of the above

Answers

Answer 1

Answer:

Answer: Lyrics B

Step-by-step explanation:

The investigation about the operating time of cordless toothbrushes is in first place associated to two tails experiment since investigation call for evalution of values under and above any given value (mean value). On the other side investigation of two different manufactures implies totally independent samples, unless these two companies have a commercial relationship which is not express in the problem ststement. Therefore the answer is lyrics B

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An installation technician for a specialized communication system is dispatched to a city only when 3 or more orders have been placed. Suppose the orders follow a Poisson distribution with a mean of 0.25 per week for a city with a population of 100,000 and suppose your city contains 800,000.a. What is the probability that a technician is required after a one-week period? b. If you are the first one in the city to place an order, what is the probability that you have to wait more than two weeks from the time you place your order until a technician is dispatched?
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What number Could be added in the expression -4 -9 that the value of the expression is 0
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What are 3 careers where similarity is used

Answers

Answer:

Management Farming Construction

Step-by-step explanation:

Swer each part. If necessary, round your answers to the nearest hundredth.(a) Ivan bought 24 pounds of rice for $10.
How many dollars did he pay per pound of rice?
dollars per pound
(b) A color printer prints 18 pages in 8 minutes.
How many pages does it print per minute?
pages per minute

Answers

Final answer:

Ivan paid $0.42 per pound of rice and the color printer prints 2.25 pages per minute.

Explanation:

(a) To find the dollars per pound, we divide the total cost by the total weight.

Dollars per pound = Total cost / Total weight

Given that Ivan bought 24 pounds of rice for $10, we can calculate: Dollars per pound = $10 / 24 pounds = $0.42 per pound (rounded to the nearest hundredth).

(b) To find the pages per minute, we divide the total number of pages by the total number of minutes.

Pages per minute = Total pages / Total minutes

Given that the color printer prints 18 pages in 8 minutes, we can calculate: Pages per minute = 18 pages / 8 minutes = 2.25 pages per minute (rounded to the nearest hundredth).

Learn more about dollars per pound, pages per minute here:

brainly.com/question/29464586

Write the equation in vertext form

Vertex: (3,6) ; y-intercept: 2

Answers

Y= a(x-3)^2+6
2= a(0-3)^2+6
2=a(-3)^2+6
2=a(9)+6
2-6=9a
-4=9a
-4/9=a

Therefore the equation in vertex form is
y = -4/9 (x-3)^2+6

The events A and B are mutually exclusive. If P(A)=0.1 and P(B)=0.4, what is P(A or B)? ASAP

Answers

Answer:

Given that the events A and B are mutually exclusive.

P(A) = 0.1

P(B) = 0.4

Mutually Exclusive Events: When two events are Mutually Exclusive it is impossible for them to happen together i.e

If A and B are two events then; P(A and B) = 0

then;

P(A or B) = P(A) +P(B)

By the definition of mutually exclusive events;

P(A or B) = P(A) +P(B) ......[1]

Substitute the values of P(A) = 0.1 and P(B) = 0.4 in [1] we have;

P(A or B) = P(A) +P(B) = 0.1+0.4 = 0.5

Which is the better buy?17-ounce jar of pickles for $8.84
2-pound jar of pickles for $25,28

Answers

Answer:

The 17 ounce. Less money per pickle.

Step-by-step explanation:

1 pound = 16 ounce
2 pound = 32 ounce
8.84/17 = $0.52 per ounce
25.28/32 = $0.79 per ounce

Based on those, the 17 ounce jar has a better deal

Solve m^2+8m=-3 by completing the square

Answers

i hope this helps you!!! be safe

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