Question
If \( n p \geq 5 \) and \( n q \geq 5 \), estimate \( P \) (more than 5 ) with \( n=14 \) and \( p=0.3 \) by using the normal distribution as an approximation to the binomial distribution; if \( n p<5 \) or \( n q<5 \), then state that the normal approximation is not suitable. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. \( P \) (more than 5 ) \( =\square \) (Round to four decimal places as needed.) B. The normal distribution cannot be used.
Ask by Peters Wagner. in the United States
Mar 09,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The normal distribution cannot be used.
Solution
We first check if the conditions for using the normal approximation to the binomial distribution are met. The conditions are:
- \( np \geq 5 \)
- \( nq \geq 5 \) where \( q = 1-p \).
Given:
- \( n = 14 \),
- \( p = 0.3 \) so that \( q = 0.7 \).
Step 1. Compute \( np \):
\[
np = 14 \times 0.3 = 4.2
\]
Since \( 4.2 < 5 \), the condition \( np \geq 5 \) is not satisfied.
Step 2. Although we can compute \( nq \):
\[
nq = 14 \times 0.7 = 9.8
\]
this condition is met; however, both conditions must be satisfied to use the normal approximation.
Conclusion: Because \( np < 5 \), the normal approximation is not suitable.
Answer: B. The normal distribution cannot be used.
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Extra Insights
Let's calculate \( n p \) and \( n q \) to see if we can use the normal approximation to the binomial distribution. Given: - \( n = 14 \) - \( p = 0.3 \) We can calculate: - \( q = 1 - p = 0.7 \) - \( n p = 14 \times 0.3 = 4.2 \) - \( n q = 14 \times 0.7 = 9.8 \) Since \( n p < 5 \), the normal approximation is not suitable. Thus, the correct choice is: B. The normal distribution cannot be used.