# Chapter 1. Other Sampling Designs

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Stat Tutor
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0:36

### Question 1.1

Correct. This idea is so important that it bears repeating: random sampling is required for valid inference.
Incorrect. This idea is so important that it bears repeating: random sampling is required for valid inference.
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1:30

### Question 1.2

Correct. A simple random sample is identified as a sampling method where every possible sample of size n has the same chance of being selected.
Incorrect. A simple random sample is identified as a sampling method where every possible sample of size n has the same chance of being selected.
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1:57

### Question 1.3

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Correct. Stratified sampling is identified as a sampling method where random samples are taken from within each stratum.
Incorrect. Stratified sampling is identified as a sampling method where random samples are taken from within each stratum.
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### Question 1.4

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Correct. This is a correct statement.
Incorrect. This is a correct statement.
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### Question 1.5

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Correct. The groups in stratified sampling are called strata; a group is called a stratum.
Incorrect. The groups in stratified sampling are called strata; a group is called a stratum.
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3:30

### Question 1.6

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Correct. For this example, the strata are the majors.
Incorrect. For this example, the strata are the majors.
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### Question 1.7

Correct. For stratified sampling, a simple random sample is taken from EVERY stratum.
Incorrect. For stratified sampling, a simple random sample is taken from EVERY stratum.
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### Question 1.8

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Correct. After taking a stratified sample, the results from each strata are combined to form a complete sample.
Incorrect. After taking a stratified sample, the results from each strata are combined to form a complete sample.
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5:11

### Question 1.9

Correct. Multistage sampling is so named because sampling is done in stages.
Incorrect. Multistage sampling is so named because sampling is done in stages.
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### Question 1.10

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Correct. For two stages, a sample of groups is taken in the first stage and then the individuals from within those groups in the second stage.
Incorrect. For two stages, a sample of groups is taken in the first stage and then the individuals from within those groups in the second stage.
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### Question 1.11

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Correct. Individuals are selected in the last stage of a multistage sample.
Incorrect. Individuals are selected in the last stage of a multistage sample.
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6:24

### Question 1.12

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Correct. In this example, states are selected in the first stage.
Incorrect. In this example, states are selected in the first stage.
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### Question 1.13

Correct. In this example, counties were selected from the sampled states in the second stage.
Incorrect. In this example, counties were selected from the sampled states in the second stage.
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### Question 1.14

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Correct. The individuals in this study are the farms. Farms were sampled in the last or third stage of this multistage sample.
Incorrect. The individuals in this study are the farms. Farms were sampled in the last or third stage of this multistage sample.
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7:43

### Question 1.15

MDLWd6XTYrWJdP/nM4THBllP7rGoIIfDpxG5TRRT2/psf8TRYzO9H+uT7kYgHZcpA1rHsE7yEnvFyV5GJqqFIYnmbAEPM6n6zgnqkYF2jUOrNJFHmJUOkWuK3f120gd1BXmQjuGbK+WE5+81kYGzCLxaFxjgBeJQjDXY/GjEI1p2uQwLS2zm8V9dSw66dbet5fFVvnbbm8GhHowfFp7fS1PP5fIzXT21i622Pxl5AmA0zNUlkV8sdB26K7Hkp3RFq8j5/xXnhPU4gR+qtC1GFCvVJ2onnEbHzwO/kBfTxU0Kj5IO3bDXOYiYkrUsIUVeIxuN/z6SL3MtTxDCS8AOfZjsdf8pVBH3na7fOEMlrXnCMjhY7tDJw13hohESK+5GkjC8MA713XlOaubiGtOvdLDDfGJxO1QdYnfKnqCrQe4QXNKsBKl6h2cSQ1vV0Eh0fNXYrKSmxBVYaV4ab5z6aTzqwjojJgBmgk1hX54c253ptT+XK8/OuCSb2KgkOwkM
Correct. In multistage sampling, groups are first sampled and then individuals are only sampled from those groups. But for stratified sampling, individuals are sampled from every group.
Incorrect. In multistage sampling, groups are first sampled and then individuals are only sampled from those groups. But for stratified sampling, individuals are sampled from every group.
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### Question 1.16

BYvihbmTsSg/GyyW+fMUckSTk7ZEuN+pHCrhyVKIyt7/1jnRKBj6bWzCdwjhbouDxlce6eH0WplnYvZNjaY/vxqkjUIyKQnKFv+uVQKe7cVzPL1kH7TC3y+71J3wbZgp3bZV0vT2wGS4xIX7kjELURacomOM+lQKUy4TmlCzlkx5K8c0lemUPoGlOaRo3vp2BIl+43uGQALvGpwVSv1yTwl2n+floEPrnZ28T9jXICHizkq0sNPhvqVng/Jcwne+HoOHxFa4F2yXT2zpsXCvclEFs726KXROinTJ0cOVxtcI8mAZ5tG1xoridY5srVkuFwCsDP7qRcY9S+mef9CA5GJcQ46/lVcxRk3+cA==
Correct. Since freshmen are sampled from every dorm, this is stratified sampling.
Incorrect. Since freshmen are sampled from every dorm, this is stratified sampling.
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### Question 1.17

YGIASQpT68X5O7u0EDqzBer9AgseZUzXC9mbA37X6cBvvNE1HXCNI/LAt+rhxmgwCQyrwi2dygbIylRyiX/nDJACt7OIp21zq/nC1032aeRLqRnMPaInc9lRsBa/SWNeQrBFPp4cRa6x4/bhRB85LUbR5oaakWJHUPgCkcbpDOCQ4PCBkcRcYvZqAbQUVuFnO/DQkQk3IVyXuaC3OPtb1xEQBkVtuKUsd6/nmgWxEGz7rihqMZUY2Ru3ipyUA1Uy+XlXeNjmydcTQOb++4Ul6jWMggmK2GEW1vVRuIW4DA/stjYiJucAnHXDSmGqODhh+Y3KHG9rhZth3t7vh7GanRqK30yEuTtRqmHh1EK0yWWO1faizEE1eGjCk1z+om3ITOEx6DDS3vHAo4iLFi1X2dU04PJVvht222cjxTGqBiFPaIgqUmfdTJU4nUE=
Correct. Since dorms are randomly selected in the first stage and freshmen are randomly selected from only those dorms in the second stage, this is multistage sampling.
Incorrect.Since dorms are randomly selected in the first stage and freshmen are randomly selected from only those dorms in the second stage, this is multistage sampling.
2
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### Question 1.18

PsAjlZWfdR3Ta12hxZOwXyzlLSNz1CExs+1/nWePdYyyNPN+lqL02M8u5evcoQU9GahL8tCT4EtYmaLBjceEjb6fTb91HFDSkzfiClzOfgGKpH0SODzW0aWvpBfxYn74gxcwNwWNfCmGdRe0ELZCt6PbDGT6934JJ4k6atKsU0sLpeLPCxUdET2kbUo75bltY8lM9w/mcz7+SzxLDGVqjjJlfymJXpF4vjaNVVL83hA+C7Wxoj1hDsdO3cX7tTNCt6UgffDrVGtWccOCQKW1ktfIErVhKlBQco/ay7lidLsNrM4j4qKZBb6Ckfi2A2Jnpzi10wPEE3mcNHuI6LKBqc/ldekb0tkGQxf+rsb55jPL7hg7T5EgBcNiNrno5/hpZQ1sTw==
Correct. Since dorms are randomly selected in the first stage and freshmen are randomly selected from only those dorms in the second stage, this is multistage sampling.
Incorrect. Since dorms are randomly selected in the first stage and freshmen are randomly selected from only those dorms in the second stage, this is multistage sampling.
2
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