Question

An auditor, pressed for time and on a low budget, is concerned with account errors on customer credit. She takes a sample of 25 accounts, and finds the account error, on average, is $-23, with a standard deviation of $16. Is the claim of the manager that errors average only $-10 supported? In this case, the null hypothesis is what?

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Math
Statistics

Hypothesis Testing

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: Today, the waves are crashing onto the beach every 5.8 seconds. The times from when a person arrives...

A: Note:Hey there! Thank you for posting the question. However, since your question has more than 3 sub...

Q: A poll asked the question, "What do you think is the most important problem facing this country toda...

A: Solution:The confidence interval formula for proportion formula is,

Q: Given a population where p = 0.10, find the standard deviation of the samping distribution when n = ...

A: It is given that p is 0.10 and n is 2,000.

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those sc...

A: Consider, X be the random variable that represents the IQ scores of adults.It is provided that, X is...

Q: Explain how the following two terms differ from each other: MSwithin-treatments and MSerror

A: We have to explain how MS within-treatment and MS Error

Q: (d) what proportion of 18-ounce bags of chips ahoy! contains fewer than 1125 chocolate chips? (e) Wh...

A: The provided information are:

Q: When I'm trying to infer the population mean from a small sample, why do I have to rely on the t-sta...

A: The assumptions for the z-statics is appropriate as given below:The samples are randomly selected fr...

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may var...

A: (a) Computation of point estimate for p:Let p be the proportion of all permanent dwellings on the en...

Q: i need help with how to figure out this problem. i don't understand how to find the solution in a ga...

A: From the provided information, if a coin is tossed and a die is rolled than the total sample space c...

Q: 3. Suppose you have the following estimated equation, alcohol = 2-1.4 log price where alcohol refers...

A: The given estimate equation is shown below.

Q: State the null and alternative hypothesis for the following: a) The average SAT in the state is repo...

A: a)Formulation of hypothesisNull Hypothesis: - mean for the local district is equal to 1010Alternativ...

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days...

A: Let us define the random variable X as the lengths of pregnancies in a small rural village are norma...

Q: The age of children in kindergarten on the first day of school is uniformly distributed between 4.71...

A: From the given information, the random variable X as the age of children in kindergarten on the firs...

Q: (Round to two decimal places as needed.) d. Find P p>0 43) The probability that p is greater than 0....

A: The provided data is sample size, n is 77 and the probability of success, p is 0.4.The mean and stan...

Q: Please give me answer of these questions?

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are sol...

Q: Find k such that P(-k < Z < k) = .6970  it might help to sketch the situation

A: To value of k can be determine as:By using Z-table,

Q: In a recent year, the mean number of strokes per hole for a famous golfer was approximately 3.7. (b)...

A: It is given that the mean number of strokes per hole for a famous golfer is 3.7.

Q: Big babies: The National Health Statistics Reports described a study in which a sample of 320 one-ye...

A:  (a)Hypotheses:Null hypothesis:H0: µ = 25Alternative hypothesis:H1: µ ≠ 25Since the alternative hypo...

Q: In jumbled box of pens and pencils, the probability of randomly choosing a sharpened pencil is .54 a...

A: Given dataprobability of randomly choosing a sharpened pencil P(S) = 0.54probability of randomly cho...

Q: A population of values has a normal distribution with μ=179 and σ=98.2. You intend to draw a random ...

A: The provided information are:Population mean (µ) = 179.Population standard deviation (σ) = 98.2Sampl...

Q: I have attached a picture of the question, please only answer section A, B, and C. Thank you.

A: Hello there! there are more than three subparts in the question. According to our policies we cannot...

Q: The US population is 13% African American.  If you were to take a SRS of 500 Americans, above what p...

A: Solution:From the given information, the proportion of African American is 0.13, random sample of si...

Q: The probability of a randomly selected adult in one country being infected with a certain virus is 0...

A: It is provided that the probability, in one country a randomly selected adult being infected with a ...

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.4 year...

A: Given information:Mean, µ=14.4Standard deviation, σ=3.8Sample size, n=23

Q: Find the area of the shaded region. The graph depicts the standard normal distribution of bone densi...

A: Given that, mean (μ) = 0 and standard deviation (σ) = 1And also given, z=-1.19 from the figure

Q: Below are the jersey numbers of 11 players randomly selected from a football team. Find the​ range, ...

A: Note: the sample size mentioned in the question is 11. But the given observation is greater than 11....

Q: The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 120 a...

A: Hello there! there are more than three subparts in the question. According to our policies we cannot...

Q: Suppose x is a normally distributed random variable with u 55 and a 4. Find a value xn of the random...

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are sol...

Q: Find the following probabilities  a.) P(Z ≤ -1.25) b.) P(Z > 1.45)

A: a)Here probability of Z is less than or equal to –1.25 represents the area to the left of –1.25.

Q: Critical Values for the Student's t Distribution Table to find the critical value or values for the ...

A: (a)The t-test considered here is a one-tailed test.The sample size is, n = 12.Since one of the degre...

Q: a sample size n=99 is drawn from a population whose standard deaviation is 11 (a) find the margin of...

A: Given information:Sample size (n)=99Standard deviation=11Confidence level=90%=0.90

Q: Jay and Jane play a game. Jay goes first. Each player on his/her turn tosses a coin. If it comes up ...

A: We know that when we toss a coin than the probability that get head is ½ and the probability that ge...

Q: Assume that x has a normal distribution with the specified mean and standard deviation. Find the ind...

A: Click to see the answer

Q: in a quiz competition, there are 5 competitors, each of whom makes a random choice out of 10 prizes,...

A: From the given information, there are 10 prizes. In 10 prizes, the number of wrist watches are 3 and...

Q: What is a P value?

A: The p-value is also called as probability value.

Q: Use the standard normal distribution (aka z distribution where mu = 0 and sigma = 1) to determine th...

A: Consider, -a and +a beConsider, -a and +a be two middle values that cover 85% of the area.Thus,two m...

Q: a previous analysis of paper boxes showed that the standard deviation of their lengths is 13 millime...

A: It is given that confidence level is 0.95, standard deviation is 13 and margin of error E is 4.Here,

Q: A population of values has a normal distribution with μ=135.9 and σ=18.1. You intend to draw a rando...

A: Given data  Mean μ=135.9Standard deviation σ=18.1Size (n) = 96a)score separating the bottom 61% scor...

Q: Based on a​ survey, assume that 27​% of consumers are comfortable having drones deliver their purcha...

A: A binomial experiment is a discrete probability experiment which is repeated for a fixed number of t...

Q: Test the given claim using the P-value method of hypothesis testing.   The health of employees is mo...

A: Introduction:Denote μ as the true mean weight of the population, from which, the sample of 54 is obt...

Q: Assume the random variable x is normally distributed with mean equals=84 and standard deviation equa...

A: z-score:A z-score is a standard score that describes the number of standard deviation away from its ...

Q: Appliance ownership- the probability that a person owns a microwave oven is 0.75, that a person owns...

A: the probability that a person owns a micro oven P(Oven) = 0.75probability that person owns a compact...

Q: Use the standard normal table to find the​ z-score that corresponds to the cumulative area 0.0877. I...

A: The concept of standard normal distribution is used to calculate the probability of a normally distr...

Q: A sample of n=4 scores is selected from a population with m=50 and standard deviation of 12. If the ...

A: It is given that the mean and standard deviation are 50 and 12, respectively.

Q: Assume that random guesses are made for eleven multiple choice questions on a medical admissions​ te...

A: Click to see the answer

Q: 3. Determine a and b for Y X1 and Y2aX bX2 such that EX1 EX2}= 0, Var(X) Var(X2) Var(Yi) Var(2) 1, C...

A: The provided information is:

Q: Consider the probability that exactly 95 out of 160 computers will not crash in a day. Assume the pr...

A: Solution:It is given that the probability that a given computer will not crash in a day is 0.62 and ...

Q: For the standard normal distribution shown on the right, find the probability of z occurring in the ...

A: The probability value is 0.1977 and it is calculated below:

Q: Please show TI 84 steps

A: Hello! As you have posted 4 sub parts, we are answering the first 3 sub-parts.  In case you require ...

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may var...

A: It is given that 39 are extroverts out of 65 professional actors.