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A basketball player who ordinarily makes about \(55 \%\) of his free throw shots has made 4 in a row. Is this evidence that he has a "hot hand" tonight? That is, is this streak so unusual that it means the probability he makes a shot must have changed? Explain.

Short Answer

Expert verified
No, the streak of four successful shots by this player who ordinarily makes 55 percent of his shots is not evidence that he has a 'hot hand' tonight. The probability of this happening is about 9.15 percent, and we would expect to see this occur about 9.15 percent of the time given the player's usual performance level and number of attempts.

Step by step solution

01

Calculating Probability

The first step is to calculate the probability that the player makes four shots in a row, given that he ordinarily makes 55 percent of his shots. For independent events, the joint probability is simply the product of the individual probabilities. Therefore, the probability that the player makes four shots in a row is \(0.55 × 0.55 × 0.55 × 0.55 = 0.0915\) or approximately 9.15 percent.
02

Analyzing the Probability

Now let's compared this calculated probability to what would be expected by chance alone. Here, we need to interpret the calculated probability. Even though 9.15 percent might seem like a low probability, it's important to remember that low-probability events can and do happen. The fact that the player made four shots in a row doesn't necessarily mean he's performing above his usual level. In fact, if he played long enough, we'd expect him to make four shots in a row about 9.15 percent of the time.
03

Conclusion

The streak of four successful shots is not so unusual as to suggest that the player has a 'hot hand'. It is rather a consequence of the player's skill level and the number of attempts he makes in the game. Therefore, this streak doesn't provide strong evidence that the player's shot-making probability has changed significantly.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Independent Events in Probability
When we refer to independent events in the realm of probability, we’re talking about scenarios where the outcome of one event doesn’t influence the outcome of another. In basketball, whether a player makes a shot or not can be considered an independent event from the next shot, assuming each shot is taken under similar conditions and there is no psychological or physical change in the player between shots.

For example, if a basketball player has a 55% chance of making a free throw, the probability of making the next shot remains 55%, irrespective of whether the previous shot was made or missed. The chances don't suddenly improve or worsen because of what happened previously – each shot is essentially a new, independent trial. Mathematically, if we want to calculate the probability of the player making four shots in a row, we would multiply the individual probabilities: \(0.55 \times 0.55 \times 0.55 \times 0.55 = 0.0915\) or 9.15%. Since each shot is independent, past performance does not affect the likelihood of success in future shots.
Joint Probability
The joint probability refers to the likelihood of two or more events happening at the same time. It’s a fundamental concept for understanding how different events can intersect. In our basketball scenario, the joint probability is calculated by multiplying the chance of making each free throw, assuming that the shots are independent events.

The formula for joint probability of independent events is simple: just multiply the probabilities of each individual event. Following our basketball player's example, we already determined the joint probability of making four consecutive free throws is 9.15%. This figure represents the combined probability of all four shots being successful in a row. It's crucial to note that joint probabilities are less intuitive than individual probabilities, because as you combine more events, the joint probability tends to be much smaller than the probabilities of the individual events.
Interpreting Probabilities
Understanding the true meaning of a probability value is crucial. A common misunderstanding is to undervalue or overvalue a probability based on its size. For instance, a 9.15% chance may seem rare, but when considering a large number of attempts, occurrences with this probability are expected to happen at some point.

Let’s apply this to our basketball problem. The player successfully making four consecutive shots may seem like a hot streak. However, if he shoots enough times, a sequence of four made shots would naturally occur about 9.15% of these stretches of four shots. Therefore, a streak, in most instances, isn’t evidence of any change in capability or luck; it's a statistical likelihood. Interpreting probabilities helps us set expectations and understand that low probability doesn't equate to impossibility – something that’s essential when watching sports and considering game strategies.
The Hot Hand Fallacy
The hot hand fallacy is a particularly fascinating concept in the field of probability, especially as it applies to sports. It is the belief that a player’s performance during a particular period is significantly better than expected, leading to the assumption that they have a 'hot hand'. Fans and players alike often believe that success in previous attempts increases the chances of success in future efforts.

In our basketball player's case, making four free throws in a row might lead spectators to believe he is 'on fire'. However, if each shot is an independent event with a 55% success rate, past success doesn't change the probability of future shots. The perception of the hot hand refers to a cognitive bias where people overestimate the significance of sequences in random data. The reality demonstrated by numerous studies is that the likelihood of success is consistent with the player’s general performance over time. So while streaks do happen—and they can be exciting to witness—they're not statistically significant enough to prove that the player has a higher likelihood of continued success.

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Most popular questions from this chapter

An American roulette wheel has 38 slots, of which 18 are red, 18 are black, and 2 are green \((0\) and 00\()\). If you spin the wheel 38 times, a. Intuitively, how many times would you expect the ball to wind up in a green slot? b. Use the formula for expected value to verify your intuition.

The basketball player in Exercise 55 has new sneakers, which he thinks improve his game. Over his past 40 shots, he's made 32 -much better than the \(55 \%\) he usually shoots. Do you think his chances of making a shot really increased? In other words, is making at least 32 of 40 shots really unusual for him? (Do you think it's his sneakers?)

A basketball player has made \(80 \%\) of his foul shots during the season. Assuming the shots are independent, find the probability that in tonight's game he a. misses for the first time on his fifth attempt. b. makes his first basket on his fourth shot. c. makes his first basket on one of his first 3 shots.

Based on concerns raised by his preliminary research, the biologist in Exercise 38 ?decides to collect and examine 150 frogs. a. Assuming the frequency of the trait is still 1 in 8 , determine the mean and standard deviation of the number of frogs with the trait he should expect to find in his sample. b. Verify that he can use a Normal model to approximate the distribution of the number of frogs with the trait. c. He found the trait in 22 of his frogs. Do you think this proves that the trait has become more common? Explain.

Justine works for an organization committed to raising money for Alzheimer's research. From past experience, the organization knows that about \(20 \%\) of all potential donors will agree to give something if contacted by phone. They also know that of all people donating, about \(5 \%\) will give \(\$ 100\) or more. On average, how many potential donors will she have to contact until she gets her first \(\$ 100\) donor?

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