Aconsumer 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

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

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.

step-by-step explanation:

let's assume

number of candles set =x

price of of x candles =p(x)

we are given

a candle maker prices one set of scented candles at $10 and sells an average of 200 sets each week

so, we get point as (200,10)

he finds that when he reduces the price by $1, he then sells 50 more candle sets each week

so, we can find slope

now, we can use point slope form of line

now, we can plug values

we can use point

and find b

now, we can plug it back

and we get

now, we can find revenue

we know that

revenue = price*quantity

so, we get