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2 years ago

What happens if none of the selector values match selector in a simple case expression in pl/sql

Computers and Technology

1 answer:

mixas84 [53]2 years ago

6 0

Answer:

If no values in WHERE clauses match the result of the selector in the CASE clause, the sequence of statements in the ELSE clause executes. ... When the IF THEN statement has no ELSE clause and the condition is not met, PL/SQL does nothing instead raising an error.

Explanation:

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Fifty-three percent of U.S households have a personal computer. In a random sample of 250 households, what is the probability th

aleksley [76]

Answer:

The correct Answer is 0.0571

Explanation:

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So, P(Having personal computer) = p = 0.53

Sample size(n) = 250

np(1-p) = 250 * 0.53 * (1 - 0.53) = 62.275 > 10

So, we can just estimate binomial distribution to normal distribution

Mean of proportion(p) = 0.53

Standard error of proportion(SE) = $\sqrt{\frac{p(1-p)}{n} }$ = $\sqrt{\frac{0.53(1-0.53)}{250} }$ = 0.0316

For x = 120, sample proportion(p) = $\frac{x}{n}$ = $\frac{120}{250}$ = 0.48

So, likelihood that fewer than 120 have a PC

= P(x < 120)

= P( p^ < 0.48 )

= P(z < $\frac{0.48-0.53}{0.0316}$ ) (z= $\frac{p^-p}{SE}$ )

= P(z < -1.58)

= 0.0571 ( From normal table )

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mariarad [96]

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Answer:

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