A district in the Ashanti region town has 102 towns and villages. If you interviewed everyone living in one village, would you be interviewing a population or a sample from the village?

Zoagliaj
2022-07-22
Answered

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frisiao

Answered 2022-07-23
Author has **13** answers

It is given that,

A district in the Ashanti region town has 102 towns and villages. It means we can divide the district into towns and villages.

We know that, if a population is divided into various group or cluster and complete sampling is done over on just a few groups or cluster, then this type of sampling scheme is said to be cluster sampling.

The above-given situation is exactly similar to that in cluster sampling.

Thus, If you interviewed everyone living in one village, we would be interviewing a Population from the village.

A district in the Ashanti region town has 102 towns and villages. It means we can divide the district into towns and villages.

We know that, if a population is divided into various group or cluster and complete sampling is done over on just a few groups or cluster, then this type of sampling scheme is said to be cluster sampling.

The above-given situation is exactly similar to that in cluster sampling.

Thus, If you interviewed everyone living in one village, we would be interviewing a Population from the village.

asked 2021-10-20

Range=max value- min value

h=r/m m=no of classes

The weights shown in data given to the nearest tenth of a pound, were obtained from a sample of 18- to 24-year-old males. Organize these data into frequency and relative-frequency distributions. Use a class width of 20 and a ﬁrst cutpoint of 120.

129.2 185.3 218.1 182.5 142.8 155.2 170.0 151.3 187.5 145.6 167.3 161.0 178.7 165.0 172.5 191.1 150.7 187.0 173.7 178.2 161.7 170.1 165.8 214.6 136.7 278.8 175.6 188.7 132.1 158.5 146.4 209.1 175.4 182.0 173.6 149.9 158.6

Also calculate cumulative frequency and midpoint.

h=r/m m=no of classes

The weights shown in data given to the nearest tenth of a pound, were obtained from a sample of 18- to 24-year-old males. Organize these data into frequency and relative-frequency distributions. Use a class width of 20 and a ﬁrst cutpoint of 120.

129.2 185.3 218.1 182.5 142.8 155.2 170.0 151.3 187.5 145.6 167.3 161.0 178.7 165.0 172.5 191.1 150.7 187.0 173.7 178.2 161.7 170.1 165.8 214.6 136.7 278.8 175.6 188.7 132.1 158.5 146.4 209.1 175.4 182.0 173.6 149.9 158.6

Also calculate cumulative frequency and midpoint.

asked 2022-01-18

You roll three dice, and you define the random variable X as the number of heads obtained. What are all possible values of the random variable X?

asked 2022-06-22

Does accelerating cosmological expansion increase beam spread?

In the standard textbook case, a transmitter of diameter $D$ can produce an electromagnetic beam of wavelength $\lambda $ that has spread angle $\theta =1.22\lambda /D$. But what happens in an expanding cosmology, especially one that accelerates so that there is an event horizon? Does $\theta $ increase with distance?

Obviously each photon will travel along a null geodesic and after conformal time $\tau $ have travelled $\chi =c\tau $ units of co-moving distance. The distance between the beam edges would in flat space be growing as $\delta =2c\mathrm{sin}(\theta /2)\tau $. Now, co-moving coordinates are nice and behave well with conformal time, so I would be mildly confident that this distance is true as measured in co-moving coordinates.

But that means that in proper distance the beam diameter is multiplied by the scale factor, $a(t)\delta $ (where $t$ is the time corresponding to $\tau $), and hence $\theta $ increases. However, the distance to the origin in these coordinates has also increased to $a(t)(ct)$, so that seems to cancel the expansion - if we measure $\theta (t)$ globally by dividing the lengths.

But it seems that locally we should see the edges getting separated at an accelerating pace; after all, the local observers will see the emitter accelerating away from them, producing a wider and wider beam near their location since it was emitted further away. From this perspective as time goes by the beam ends up closer and closer to $\theta =\pi $ (and ever more red-shifted, which presumably keeps the total power across it constant).

Does this analysis work, or did I slip on one or more coordinate systems?

In the standard textbook case, a transmitter of diameter $D$ can produce an electromagnetic beam of wavelength $\lambda $ that has spread angle $\theta =1.22\lambda /D$. But what happens in an expanding cosmology, especially one that accelerates so that there is an event horizon? Does $\theta $ increase with distance?

Obviously each photon will travel along a null geodesic and after conformal time $\tau $ have travelled $\chi =c\tau $ units of co-moving distance. The distance between the beam edges would in flat space be growing as $\delta =2c\mathrm{sin}(\theta /2)\tau $. Now, co-moving coordinates are nice and behave well with conformal time, so I would be mildly confident that this distance is true as measured in co-moving coordinates.

But that means that in proper distance the beam diameter is multiplied by the scale factor, $a(t)\delta $ (where $t$ is the time corresponding to $\tau $), and hence $\theta $ increases. However, the distance to the origin in these coordinates has also increased to $a(t)(ct)$, so that seems to cancel the expansion - if we measure $\theta (t)$ globally by dividing the lengths.

But it seems that locally we should see the edges getting separated at an accelerating pace; after all, the local observers will see the emitter accelerating away from them, producing a wider and wider beam near their location since it was emitted further away. From this perspective as time goes by the beam ends up closer and closer to $\theta =\pi $ (and ever more red-shifted, which presumably keeps the total power across it constant).

Does this analysis work, or did I slip on one or more coordinate systems?

asked 2021-08-14

The two-way table gives the party affiliation of all members of the House of Representatives from eight different regions in the United States in July 2014 (there were 3 vacant seats at that time).

asked 2022-03-01

A preliminary sample of 1200 engineers has been taken, out of which 260 are females. The sample is used to estimate the proportion of female engineers denoted by pF .

Estimate the 95% confidence interval for pF.

Estimate the 95% confidence interval for pF.

asked 2021-11-05

For a test of ${H}_{0}:\text{}p=0.5,$ the z test statistic equals 1.74. Find the p-value for ${H}_{a}:\text{}p0.5$ .

a) 0.0446

b) 0.0409

c) 0.892

d) 0.9591

e) 0.0818

f) 0.9554

a) 0.0446

b) 0.0409

c) 0.892

d) 0.9591

e) 0.0818

f) 0.9554

asked 2021-06-20

Define the following terms: a. Observational study, b. Designed experiment.