A multiple-choice examination consists of 85 questions, each having possible choices a, b, c, and d. Approximate the probability that a student will get more than 20 answers correct if he randomly guesses at each answer. (Note that, if he randomly guesses at each answer, then the probability that he gets any one answer correct is 0.25.) Use the normal approximation to the binomial with a correction for continuity. Round your answer to at least three decimal places. Do not round any intermediate steps.

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Q: What did you do to identify the area of the shaded region?

A: For normal distribution we use normal table to find the area of the region.

Q: The probability of 6 P events when N = 10 and P = .7 is the same as 4 Q events if Q=.3 and N=10.

A: here use basic of binomial 

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A: Hypothesis testing uses data from sample to draw conclusions on population parameter.

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A: Given information:- Week Number of calls 1 50 2 35 3 25 4 40 5 45 6 35 7 20 8 30 ...

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A: Solution

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A: The objective is to define the area (in terms of proportion) below or above the given z-scores.

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A: Sine we only answer up to three sub-parts for a question, we will answer a, b, and c respectively. P...

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A: The test Subjects are shown 625 objects, N=625 the test subject remembers 80% of the objects after t...

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A: In research, it is very critical to identify the research problem in formulating the topic to be stu...

Q: A normal distribution has a population mean of u=75 and a standard deviation of o=9. What is the P(X...

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Q: ales In a survey, 16 people were asked how much they spent on their child's last birthday gift. The ...

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Q: Express the confidence interval (0.021,0.109) in the form of p- E<p<p+E. |<p< (Type integers or deci...

A: Solution-: Given C.I. is (0.021,0.109) We write it in the form of p^-E&lt;p&lt;p^+E

Q: 5. If a researcher rejects a true null hypothesis, she has made a error.

A: here use basic of statistical error 

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A: Here is given that, mean of the data is 2.85 of 16 observations.

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Q: A published report claims that 35% of college students have used an online dating site or app.  Beli...

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Q: In 1980, census results indicated that the age at which American men first married had a mean of 23....

A: Given: Sample size, n=40 Sample mean,x¯=24.2Sample sd, s=5.3α=0.05 

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A: Land worth = 1200,000 We have to use long divider method to know every one share. Here Chooser 1    ...

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A: Given that, there are numbers from 1 to 200. Four random numbers are picked. We need to find the pro...

Q: smart phone manufacturer is interested in constructing a 90% confidence interval for the proportion ...

A: Given that  n=1700, X=84   90% confidence interval  C.I= (p  ±  Zc*√(p(1 - p)/n))

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A: Given that mean u = 55 and standard deviation o = 9.

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A: Given We need to choose appropriate option in given options to given statement.  

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A: Solution-: We identify the claim and state the H0 and Ha  

Q: The distribution of certain test scores is a nonstandard normal distribution with a mean of 50 and a...

A: Given info: The distribution of certain test scores is a nonstandard normal distribution with a mean...

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A:

Q: A survey showed that 33% of human resource professionals are at companies that rejected job candidat...

A: Given: Probability that human resource professionals reject the candidates, p=0.33 Sample size, n=25

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A: Let  μ1 and μ2 be the average salary of statistician from each region.

Q: Do the histogram

A: Histogram is the graph used to visualize the categorical data. It is used to understand the spread a...

Q: 6. Which of the following can be a correct decision? A. Accept the null hypothesis B. Accept the alt...

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Q: A sample of n=25 individuals is randomly selected from a population with a mean of p=65, and a treat...

A:  Given that  x̄ = 70 ,   μ = 65 ,  s = 20 ,  n = 25   Test statistic ( t  )  t = ( x̄ -  μ  )/(s/√(n...

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Q: If 49 percent of the total variability of Y is accounted for by X, what is the value of r? a. 0.51 O...

A: