Someone give me the answer plssssss

Choose the right answer. A series of light brown lines drawn at intervals of 50 feet to designate their respective heights above

Natali [406]

Answer:

Contour lines

Step-by-step explanation:

A series of light brown lines drawn at intervals of 50 feet to designate their respective heights above sea level are called CONTOUR lines, or just contour.

A contour line (also called isoline) is a line that indicates points at the same elevation on the map, showing you a representation of the terrain's elevation (hills, mountains, canyons and so on). You will find those lines on specialized maps, like topographic maps, which are different than road maps.

8 0

2 years ago

In an experiment, some diseased mice were randomly divided into two groups. One group was given an experimental drug, and one wa

damaskus [11]

Answer:

D)Yes, because the difference in the means in the actual experiment was more than two standard deviations from 0.

Step-by-step explanation:

We will test the hypothesis on the difference between means.

We have a sample 1 with mean M1=18.2 (drug group) and a sample 2 with mean M2=15.9 (no-drug group).

Then, the difference between means is:

$M_d=M_1-M_2=18.2-15.9=2.3$

If the standard deviation of the differences of the sample means of the two groups was 1.1 days, the t-statistic can be calculated as:

$t=\dfrac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\dfrac{2.3-(0)}{1.1}=2.09$

The critical value for a two tailed test with confidence of 95% (level of significance of 0.05) is t=z=1.96, assuming a large sample.

This is approximately 2 standards deviation (z=2).

The test statistict=2.09 is bigger than the critical value and lies in the rejection region, so the effect is significant. The null hypothesis would be rejected: the difference between means is significant.

4 0

2 years ago

Shania's test scores in 8 subjects were 88, 91, 85, 74, 69, 72, 80, and 87. Which measure should Shania use to find how much the

valina [46]

Answer with explanation:

Test Scores of Shania's in 8 subject are: 88, 91, 85, 74, 69, 72, 80, and 87.

To calculate mean we add all the variate and divide by total number of Variate in the data set.

So, Mean of the Data set

$=\frac{88+ 91+ 85+ 74+69+ 72+ 80+ 87}{8}\\\\=\frac{646}{8}\\\\=80.75$

To calculate , how much the scores on her tests vary, on average, from the mean score

We will Calculate mean absolute Deviation.

To calculate it,we will find absolute difference of each variate from mean.

| 88 - 80.75|=7.25

|91-80.75|=10.25

|85 -80.75|=4.25

|74-80.75|=6.75

......

........

Then Shania should calculate mean of the new data set obtained,which is absolute difference of each variate from mean.

→The Measure that,Shania should use to find how much the scores on her tests vary, on average, from the mean score is:

Mean absolute deviation

8 0

2 years ago

Ms. Canciano was putting ribbon around a bulletim broard. She used 28 inches of ribbon to go all the way around and knew that th

Nadya [2.5K]

Answer:

48 sq inches

Step-by-step explanation:

Given that,

Ribbon used around a bulletin broard is 28 inches

The length of her board is 6 inches

Let B is breadth of her board. 28 inches is perimeter. The perimeter of rectangle is given by :

P = 2(L+B)

28=2(6+B)

14=6+B

B=8 inches

The area of a rectangle is given by :

A = L×B

A = 8×6

A=48 sq inches

So, the area of her board is 48 sq inches

5 0

2 years ago

. Use the data from question 2. If the data are normally distributed, find the percentage of families who spent: a. Less than $1

Marina CMI [18]

Find the percentage of families who spent: a. Less than $167 per day. b. Less than $367 per day. c. More than $247 per day. d. More than $350 per day. e. Less than $67 per day. f. Between $200 and $300 per day. g. Between $360 and $400 per day. h. More than the median. i.

8 0

2 years ago