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Ne4ueva [31]
3 years ago
14

Explain how to do 7.86×4.6

Mathematics
1 answer:
nasty-shy [4]3 years ago
4 0
7.86×4.6=361.56 is the answer.
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Within a school district, students were randomly assigned to one of two Math teachers - Mrs. Smith and Mrs. Jones. After the ass
mestny [16]

Answer: Yes we conclude that both teachers are effective.

Step-by-step explanation:

Null Hypothesis, H_0 : \mu _1 = \mu _2  { It means both teachers are equally effective}

Alternate Hypothesis, H_1 : \mu _1 < \mu _2  or

The test statistics here we use is :

                                   \frac{(X_1bar - X_2bar)-(\mu _1-\mu _2)}{s_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}  ~ t_(_n_1 _+ _n_2 _-_2)

So now we will indicate each and every expression in the above test statistics,

X_1bar is the average test score of Mrs. smith's students = 78

X_2bar is the average test score of Mrs. Jones' students = 85

Formula for s_p =  \sqrt{\frac{(n_1-1)s_1^{2}+(n_2-1)s_2^{2}}{n_1+n_2-2}} ,where s_1 = 10 and s_2 = 15

                                                                       n_1 = 30 and n_2 = 25

putting values in s_p, we get

Now solving Test Statistics = \frac{(78-85)-0}{12.51414\sqrt{\frac{1}{30}+\frac{1}{25}}}  follows t_3_0_+_2_5_-_2

                                             = -2.0656 follows t_5_3

From the t table at 5% level of significance we know that our level of significance will lie between degree freedom 40 and 50 which is 1.684 to 1.671 and our test statistics is way more than this,

Hence we have do not have sufficient evidence to reject null hypothesis and we conclude that both teachers are equally effective.

3 0
3 years ago
If you can help please do :)
astraxan [27]

Step-by-step explanation:

A

180 - 60 - 70 = 50 \\x = 180 - 50 = 130 \\ x = 130

6 0
2 years ago
What is the final amount if 457 is decreased by 1% followed by a further 3% decrease? Give your answer rounded to 2 DP.
kaheart [24]

Answer:

438.86

Step-by-step explanation:

1. 457 x 0.99 = 452.43 - Decreased by 1%

2. We need to decrease 452.43 again but this time by 3% - 452.43 x 0.97

3. This gives us an answer of 438.8571

4. Finally we need to round this to 2DP, the 7 (438.8571) rounds up so the number to the left increases. This leaves an answer of 438.86

Hope this helps :D

4 0
3 years ago
-6 (3t - 6) - 3 (11t - 3)
Ronch [10]

Answer:

-51t+45

Step-by-step explanation:

-6(3t-6)-3(11t-3)

-18t+36-33t+9

-51t+45

6 0
3 years ago
Prove by factorization √16×81=√16×√81
Oksanka [162]

Answer:

√16×81 = 4×9 or √1296 = 36

√16×√81 = 4×9 = 36

Step-by-step explanation:

√81×16

We simplify 81 and 16 by prime factorisation (expressing a number as a product of its prime factors).

√81 = √3×3×3×3 = √9×9 = √9² = 9

√16 = √2×2×2×2 = √4×4 = √4² = 4

4 0
3 years ago
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