A stroke victim should receive medical attention within 12 minuten What proporti

Question

A stroke victim should receive medical attention within 12 minuten What proportion of emergeney patients will get attention within 12 minutest (A) 40% (11) 44% (c) so% (D) 20% (E) 12.3% 19. A 96% confidence interval for " population mean is constructed using Z.What is an appropriate value for )1.96 (B) 1.7S (C1.64 (D)205 () 1.28 Use this information for problems 20 and a1. The waiting times at a bank are normally distributed with a mean of 4 minutes and a standard deviation of 1.8 minutes 20. What is the approsimate 45h percentile waiting time? (C) 45'nin (D) 5.8 min (E) 2.2 min (A) 8 min (B) 4.2 min 21. Consider the following seatter plots with the indicated correlation rs rs What is the relationship among ri,r and ra? (c) (D) (E) impossible (A) n

Explanation / Answer

18. The option E is correct means 12.5%.

The proportion of emergency patients will get attention within 12 minutes is very less means 12.5% because above already stated that “A Stroke victim should receive medical attention within 12 minutes”.

19. The option D is correct.

A 96% confidence interval for a population mean is constructed using

Z-value is calculated by, (1 – 0.96)/2 = 0.020

So, first step is 1 – 0.020 = 0.980

Second step look in to the table, look the 0.980 in the Z-table

The Zx value for 96% Confidence Interval is 2.05

20. The option is A is correct.

They give mean 4 and sd 1.8,

They want to calculate 45th percentile.

The 45th percentile that holds 45% below and 65% above.

To compute 45th percentile we use formula, X= + Z,

Z-value for 45th percentile: we will see 0.45 in normal table, so corresponding value is 0.4522 and z-value is -0.12

X= 4 - 0.12*1.8 = 3.78

X = 3.8

21. The option D is correct

By looking the scatter plot,

For r1 the negative correlation between two variables

For r2 the Positive correlation between two variables

And for r3 perfect negative correlation between two variables.

So, r3 < r1 < r2

22. The option B is correct,

The probability of rejecting H0 when H0 is false.

See,

Type I error: : we reject the null hypothesis H0 when the null hypothesis H0 is true.

Type II error: : we fail to reject the null hypothesis H0 when the alternative hypothesis HA is true.

The power is denoted by, 1-

Power: The power of a hypothesis test is the probability of making the correct decision if the alternative hypothesis is true. That is, the power of a hypothesis test is the probability of rejecting the null hypothesis H0 when the alternative hypothesis HA is the hypothesis that is true (H0 is false).

23. The option B is correct.

Given jar containing 3 red, 4 green and 5 yellow candies. So total 12 candies.

The probability of red cadies is 3/12

The probability of green cadies is 4/12

The probability of yellow cadies is 5/12

The probability of exactly 3 yellow candies is (5 3) / (12 7)

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