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allochka39001 [22]
3 years ago
10

A trade magazine routinely checks the​ drive-through service times of​ fast-food restaurants. Upper A 95​% confidence interval t

hat results from examining 745 customers in one​ fast-food chain's​ drive-through has a lower bound of 177.6 seconds and an upper bound of 181.0 seconds. What does this​ mean?
Mathematics
1 answer:
katen-ka-za [31]3 years ago
8 0

Answer:

-A person can be 95% confident that the mean drive through service time  lies between 177.6 seconds and 181.0 seconds.

Step-by-step explanation:

- Confidence level is the degree of certainty we have on a particular statistic.

-The 95% confidence interval means that we are 95% confident that the mean drive through service time is lies between 177.6 seconds and 181.0 minutes.

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An experimenter is studying the effects of temperature, pressure, and type of catalyst on yield from a certain chemical reaction
Andrews [41]

Answer:

a) 120 possible experimental runs

b) 8 possible experimental runs

c) 0

Step-by-step explanation:

a. For the experiment, there are 6 different temperatures (T), 5 different pressures (P), and 4 different catalysts (C). We can find the total number of combinations using the product rule.

N = T × P × C

N = 6 × 5 × 4 = 120

b) If we use only the lowest temperature, we have T = 1, and if we use the two lowest pressures, we have P = 2. We can find the total number of combinations using the product rule.

N = T × P × C

N = 1 × 2 × 4 = 8

c) If we perform 5 experimental runs with 4 possible catalysts, it is not possible to use a different catalyst each time. At least, 1 catalyst must be repeated twice. Then, the event "a different catalyst is used on each run" has a probability of 0.

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2 years ago
A bag contains 2 blue, 4 green, and 3 white chips. What is the probability of drawing a blue chip, replacing it, then drawing a
Brrunno [24]
2 blue, 4 green, 3 white....total of 9 chips

P(blue) = 2/9
replacing
P(green) = 4/9

P(both events happening) = 2/9 * 4/9 = 8/81 <==
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3 years ago
Kate paid $27 for a dress that was on sale at 10% off. What was the original price for this dress?
Art [367]

Answer:

$30

Step-by-step explanation:

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Answer:

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Arturiano [62]

Answer:

  BD = √97 cm ≈ 9.849 cm

Step-by-step explanation:

Diagonal BD of rectangle ABCD is the hypotenuse of right triangle ABD. Opposite sides of the rectangle are the same length, so we have ...

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The sides are related to the diagonals by the Pythagorean theorem.

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The Pythagorean theorem tells you the relation between sides and hypotenuse of a right triangle:

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