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3 years ago

What is 2.6 divided by 0.4

Mathematics

1 answer:

Helen [10]3 years ago

8 0

Answer:

6.5

Step-by-step explanation:

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Ms wilson surveyed her class of 36 students about their favorite icecream flavors. Two thirds preferred chocolate. One fourth pr

mafiozo [28]

Answer- 9 students preferred vanilla
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4 years ago

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A new post-surgical treatment is being compared with a standard treatment. Seven subjects receive the new treatment, while seven

a_sh-v [17]

Answer:

$(17.714-28.714) -2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -19.745$

$(17.714-28.714) +2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -2.255$

Step-by-step explanation:

For this case we have the following info given:

Treatment: 12 13 15 19 20 21 24

Control: 18 23 24 30 32 35 39

We can find the sample mean and deviations with the the following formulas:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

$s =\sqrt{\frac{\sum_{i=1}^n (X_i- \bar X)^2}{n-1}}$

And repaplacing we got:

$\bar X_T = 17.714$ the sample mean for treatment

$\bar X_C = 28.714$ the sample mean for treatment

$s_T= 4.461$ the sample deviation for treatment

$s_C= 7.387$ the sample deviation for control

$n_T= n_C= 7$ the sample size for each sample

The degrees of freedom are given by:

$df= 7+7-2= 12$

The confidence interval for the difference of means is given by:

$(\bar X_T -\bar X_C) \pm t_{\alpha/2} \sqrt{\frac{s^2_T}{n_T} +\frac{s^2_C}{n_C}}$

The confidence is 98% so then the significance is $\alpha=0.02$ and $\alpha/2 =0.01$ . Then the critical value would be:

$t_{\alpha/2}=2.681$

And replacing we got:

$(17.714-28.714) -2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -19.745$

$(17.714-28.714) +2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -2.255$

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4 years ago

Application of percentages

musickatia [10]

Answer:

600

Step-by-step explanation:

convert 25% to a a decimal then divide 150 by .25

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2 years ago

Need help ASAP! Will mark brainliest!!!!!

Svetllana [295]

Answer:

The answer is B, 13

Step-by-step explanation:

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3 years ago

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What is the volume of a cone (in cubic inches) with a radius of 6 inches and a height of 3 inches? Use 3.14 for π. Round your an

ira [324]

Answer:

113.04 cubic inches

Step-by-step explanation:

V=π * r^2 *(h/3)

V= 3.14 * 36 * (3/3)

V = 3.14 * 36 * 1 = 113.04

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3 years ago