Help please Brainleaest!

Mathematics

1 answer:

tigry1 [53]3 years ago

4 0

Answer:

Question 1 of 7, Step 1 of 2 B/21 Correct Consider the following frequency table representing the distribution of the length of a screw used in a bookshelf assembly in inches) Length of a Screw in Inches) Class Frequency 15 10 0.31-0.35 0.36-0.40 0.41-0.45 0.46-0.50 0.51-0.55 15 12 6 Step 1 of 2: Determine the midpoint for the third class.

Step-by-step explanation:

You might be interested in

Kim bought a hat. in California. The hat cost $15 before the 8% sales tax was applied. How much did Kim pay for the hat after ta

gizmo_the_mogwai [7]

Answer:

$16.2

Step-by-step explanation:

15 x .08 [wonder how i got .08? 8% = 0.8]

= 1.2

here's where most people mess up, they usually forget to add the tax to the original cost.

15 + 1.2=

$16.2

7 0

2 years ago

Weinstein, McDermott, and Roediger report that students who were givne questions to be answered while studying new material had

emmainna [20.7K]

<h2>Answer with explanation:</h2>

Let $\mu$ be the population mean.

By considering the given information , we have

Null hypothesis : $H_0: \mu=73.4$

Alternative hypothesis : $H_a: \mu>73.4$

Since alternative hypothesis is right-tailed , so the test is a right-tailed test.

Given : Sample size : n=16 , which is a small sample , so we use t-test.

Sample mean: $\overline{x}=78.3$ ;

Standard deviation: $s=8.4$

Test statistic for population mean:

$t=\dfrac{\overline{x}-\mu}{\dfrac{s}{\sqrt{n}}}$

i.e. $t=\dfrac{78.3-73.4}{\dfrac{8.4}{\sqrt{16}}}\approx2.333$

Using the standard normal distribution table of t , we have

Critical value for $\alpha=0.01$ : $t_{(n-1,\alpha)}=t_{(15,0.01)}=2.602$

Since , the absolute value of t (2.333) is smaller than the critical value of t (2.602) , it means we do not have sufficient evidence to reject the null hypothesis.

Hence, we conclude that we do not have enough evidence to support the claim that answering questions while studying produce significantly higher exam scores.

3 0

2 years ago

Using the standard 28/36 guidelines, what is the maximum mortgage payment allowed for someone with an annual salary of $60,750?

Anna11 [10]

$\frac{28}{36}$ rule says that 28 % of your total income should be spent on Housing finances and 36 % of your gross total income should be spend for Debts.