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2 years ago

One Monday in December, it was -8ºC in Harbin, China and −2ºC in Beijing, China.

1 answer:

3 0

Based on the temperature in the various cities, we can calculate that it was 13° C warmer in Shanghai than in Harbin.

Temperature in Shanghai was:

= Temperature in Beijing + Difference in temperatures

= -2 + 7

= 5°C

Temperature difference between Shanghai and Harbin is therefore:

= 5 - (-8)

= 5 + 8

= 13°C

In conclusion, it was 13°C warmer.

Find out more about temperature differences at brainly.com/question/26039737.

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What is the slope of the line?

timurjin [86]

Answer:

24'

Step-by-step explanation:

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3 years ago

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A sample of 81 tobacco smokers who recently completed a new smoking-cessation program were asked to rate the effectiveness of th

Kruka [31]

Answer:

95% confidence interval for the true mean score is [4.6 , 6.6].

Step-by-step explanation:

We are given that a sample of 81 tobacco smokers who recently completed a new smoking-cessation program were asked to rate the effectiveness of the program on a scale of 1 to 10.

The average rating was 5.6 and the standard deviation was 4.6.

Firstly, the pivotal quantity for 95% confidence interval for the true mean is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample average rating = 5.6

s = sample standard deviation = 4.6

n = sample of tobacco smokers = 81

$\mu$ = population mean score

Here for constructing 95% confidence interval we have used One-sample t test statistics as we don't know about population standard deviation.

So, 95% confidence interval for the population mean score, $\mu$ is ;

P(-1.993 < $t_8_0$ < 1.993) = 0.95 {As the critical value of t at 80 degree of

freedom are -1.993 & 1.993 with P = 2.5%}

P(-1.993 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 1.993) = 0.95

P( $-1.993 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $1.993 \times {\frac{s}{\sqrt{n} } }$ ) = 0.95

P( $\bar X-1.993 \times {\frac{s}{\sqrt{n} } }$ < $\mu$ < $\bar X+1.993 \times {\frac{s}{\sqrt{n} } }$ ) = 0.95

95% confidence interval for $\mu$ = [ $\bar X-1.993 \times {\frac{s}{\sqrt{n} } }$ , $\bar X+1.993 \times {\frac{s}{\sqrt{n} } }$ ]

= [ $5.6-1.993 \times {\frac{4.6}{\sqrt{81} } }$ , $5.6+1.993 \times {\frac{4.6}{\sqrt{81} } }$ ]

= [4.6 , 6.6]

Therefore, 95% confidence interval for the true mean score is [4.6 , 6.6].

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3 years ago

What polynomial has a graph that passes through the given points? (-2,-3),(-1,0),(1,12),(3,72)

creativ13 [48]

You can always match 4 points using a cubic polynomial. A graphing calculator can find a cubic regression equation for you. This set of points is matched by
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