Random assignment Researchers recruited 20volunteers—8men and 12women—to take part in an experiment. They randomly assigned the subjects

into two groups of 10people each. To their surprise, 6of the 8men were randomly assigned to the same treatment. Should they be surprised? Design and carry out a simulation to estimate the probability that the random assignment puts 6or more men in the same group. Follow the four-step

process.

Short Answer

Expert verified

There will be 2 to 6 men as a result. Yes, they should be taken aback.

Step by step solution

01

Step 1. Given Information    

There were a total of volunteers n=20,M=8,W=12 We'll need to devise and carry out an experiment to determine the likelihood that the random selection will result in a group of six or more males.

02

Step 2. Concept Used  

We can't foresee the outcomes of a chance process, yet they have a regular distribution over a large number of repetitions. According to the law of large numbers, the fraction of times a specific event occurs in numerous repetitions approaches a single number. The likelihood of a chance outcome is its long-run relative frequency. A probability is a number between 0(never happens) and 1(happens frequently) (always occurs).

03

Step 3. Explanation

We should, in order to carry out the simulation, Use two-digit numbers instead of three-digit numbers. Assign the numbers to 01to 08a man. A woman is represented by the numerals 09to 20 through Ignore the numerals 00 through , as well as the number 21to 99Pick ten numbers at random between 01and 20, with no repetitions permitted. Count how many men are in the sample. Rep this simulation as many times as you like. You'll probably get between 2and 6males as a result, and sure, they should be startled.

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Most popular questions from this chapter

Monty Hall problem In Parade magazine, a reader posed the following question to Marilyn vos Savant and the “Ask Marilyn” column: Suppose you’re on a game show, and you’re given the choice of three doors. Behind one door is a car, behind the others, goats. You pick a door, say #1, and the host, who knows what’s behind the doors, opens another door, say #3, which has a

goat. He says to you, “Do you want to pick door #2?” Is it to your advantage to switch your choice of doors? The game show in question was Let’s Make a Deal and the host was Monty Hall. Here’s the first part of Marilyn’s response: “Yes; you should switch. The first door has a 1/3 chance of winning, but

the second door has a 2/3 chance.” Thousands of readers wrote to Marilyn to disagree with her answer. But she held her ground.

(a) Use an online Let’s Make a Deal applet to perform at least 50 repetitions of the simulation. Record whether you stay or switch (try to do each about half

the time) and the outcome of each repetition.

(b) Do you agree with Marilyn or her readers? Explain.

Fill ’er up Refer to Exercise 83. Given that the customer paid with a credit card, find the probability that she bought premium gas.

Playing cards Shuffle a standard deck of playing cards and deal one card. Define events J: getting a jack, and R: getting a red card.

(a) Construct a two-way table that describes the sample space in terms of events J and R.

(b) Find P(J) and P(R).

(c) Describe the event “J and R” in words. Then find P(JandR)

(d) Explain why P(JorR)P(J)+P(R) Then use the general addition rule to compute P(JorR).

Scrabble Refer to Exercise 20. About 3% of the time, the first player in Scrabble can “bingo” by playing all 7 tiles on the first turn. How many games

of Scrabble would you expect to have to play, on average, for this to happen? Design and carry out a simulation to answer this question. Follow the four step

process.

Shuffle a standard deck of cards, and turn over the top two cards, one at a time. Define events A: first card is a heart, and B: second card is a heart.

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