TRUE OR FALSE: More land is set aside for animal grazing in the western United States than for anything else

Altering photographs was part of joseph stalin’s effort to promote democracy. Censor the communist party. Persecute visual artis

zlopas [31]

Altering photographs was part of Joseph Stalin's effort to Change historical facts.

<h3>Can historical facts be altered?</h3>

There are a lot of cases where familiar history seems to be changed or altered.

The act of revisiting often changes the interpretations in a lot of ways by historians and as such, altering photographs was a means used by Joseph Stalin's effort to change of historical facts.

Learn more about photographs from

brainly.com/question/25821700

6 0

2 years ago

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The quality-control manager at a compact fluorescent light bulb factory need to determine whether the mean life of a large shipm

svet-max [94.6K]

Complete Question:

The mean life of a large shipment of CFLs is equal to 7,500 hours. The population standard deviation is 1,000 hours. A random sample of 64 CFLs indicate a sample life of 7,250 hours.

1. State the Null and Alternative Hypothesis.

2. At the 0.05 level of significance, is there evidence that mean life is different from 7,500 hours.

3. Construct a 95% confidence interval estimate of the population mean life of the CFLs.

4. Compute the p-value and interpret its meaning.

Answer:

-2, (7005, 7450), 0.045

Explanation:

1).

H₀: mean of life shipment is 7500 hours

the hypothesis are outlined as follows

H₀: $\mu =$ 7500

H₁: $\mu \neq$ 7500

where, n = 64, x = 7250, $\sigma =$ 1000 hours

Test statistics:

$Z = \frac{7250-7500}{\frac{1000}{\sqrt{64}} } \\\\Z = -2$

Our conclusion from the above result is that there is sufficient evidence to say that the mean life is different from 7500 hours

2). 95% confidence Interval for the population mean $\mu$ is

$[7250-1.96\times \frac{1000}{\sqrt{64}},7250+1.96\times \frac{1000}{\sqrt{64}} ]\\\\(7005,7495)$

3).

the p-value is given by

$p-value =2P(Z\leq -|z|)\\\\p-value =2P(Z\leq -|2|)\\\\p-value = 0.0455$

8 0

3 years ago

A tortoise and a hare engage in a race. A tortoise can run with a speed of 0. 15 m/s. A hare can run 25 times as fast as the tor

Nonamiya [84]

Let D be the total length of the race, and T the time it takes for the tortoise to finish it. Then

D = (0.15 m/s) T

Let t be the time after the start of the race when the hare decides to take a nap. In this time, the tortoise travels a distance

(0.15 m/s) t

and the hare travels

25 (0.15 m/s) t = (3.75 m/s) t

For the next 5.0 min = 300 s, the tortoise keeps moving and covers a distance of

(0.15 m/s) (300 s) = 45 m

while the hare covers no distance.

After these 300 seconds, the remaining time for the tortoise to complete the race is (T - t - 300 s). In this same time, the hare loses the race by 35 cm = 0.35 m, so overall it has covered a total distance of

(3.75 m/s) t + 0 (300 s) + (3.75 m/s) (T - t - 300 s) = D - 0.35 m

Solve for T :

(3.75 m/s) t + 0 + (3.75 m/s) T - (3.75 m/s) t - 1125 m = D - 0.35 m

(3.75 m/s) T - 1125 m = D - 0.35 m

(3.75 m/s) T - 1125 m = (0.15 m/s) T - 0.35 m

(3.60 m/s) T = 1124.65 m

T = 312.403 s

(b) So, the race takes about 312 seconds, or 5.21 minutes.

(a) It also follows that the race has a total length of

D = (0.15 m/s) (312.403 s) ≈ 46.9 m

5 0

2 years ago

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into

Vikentia [17]

<u>Answer:</u>

solubility

<u>Explanation:</u>

• Solubility is the property of an object that makes it dissolve in a solvent, thus making it 'disappear'. This is what is happening in the question.

• Conductivity is the property of a material that allows it to conduct electricity, i.e., it allows electricity to pass through it.

6 0

1 year ago

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A researcher selects a sample from a district such that 25% of the children are between ages 5 and 6, 25% are between ages 7 and

Llana [10]

Answer:

Quota.

Explanation:

In Statistics, sampling can be defined as a process used to collect or select data (objects, observations, or individuals) from a larger statistical population using specific procedures.

There are various types of sampling used by researchers and these are;

1. Random sampling.

2. Systematic sampling.

3. Stratified sampling.

4. Cluster sampling.

5. Opportunity or convenience sampling.

6. Quota sampling.

Quota sampling can be defined as a non-probability sampling technique wherein a sample comprising of data from a population or homogeneous group are created.

In this scenario, a researcher selects a sample from a district such that 25% of the children are between ages 5 and 6, 25% are between ages 7 and 8, 25% are between 9 and 10, and 25% are between ages 11 and 12. Thus, the researcher is employing a quota sampling.

6 0

3 years ago