A survey asks a random sample of 1500 adults in Ohio if they support an increase in the state sales tax from 5% to 6%, with the additional revenue going to education. Let X denote the number in the sample that says they support the increase. Suppose that 40% of all adults in Ohio support the increase. The standard deviation of X is?

Q: A random sample of 40 students has a mean annual earnings of​ $3120 and assume that the population…

A:

Q: A random sample of 6 people who went on a diet recorded their weight loss (in pounds) "xx" after 3…

A: Basics:   Mean x=ΣxnStandard deviation is given by:  S.d=Σx2-nx2n-1

Q: Given a sample with a mean of 57 and a standard deviation of 14, find x such that Pr(X < x) = 0.022.…

A:

Q: Assume that​ men's heights have a distribution that is symmetrical and​ unimodal, with a mean of 70…

A: We hava given that,  Let X be the men's height from Symmetrical and distribution with mean (μ) = 70…

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Consider X be a normal random variable which indicates the readings of a thermometer. The readings…

Q: Suppose that in an examination, the cut-off score for passing is 75 for 200 persons. If the mean of…

A:

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: The marks obtained by the students in an examination are known to be normally distributed with a…

A: If the marks are denoted by X then it is asked to find the value of PX&lt;45 which can be computed…

Q: The annual income of residents in a county is $42,000 with a standard deviation of $10,000.  Under…

A: From the given information, the distribution of annual incomes is normally distributed with mean…

Q: Customers at a certain pharmacyspend an average of $54.40, with a standard deviation of $13.50.…

A: It is given that customers at a certain pharmacy spend an average of 54.40, with a standard…

Q: Suppose that a petrol station has its daily demand for petrol as normally distributed with a mean of…

A:

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: From the provided information, X ~ N (0, 1) Here 0 is the mean and 1 is the standard deviation.

Q: Given a sample with a mean of 151 and a standard deviation of 27, find x such that Pr(X > x) =…

A:

Q: Suppose a company produces lightbulbs with a mean lifetime of 1000 hours and a standard deviation of…

A: we have to find z score

Q: A group of 1100 persons had an average income of $180 with a standard deviation of v121.36. Out of…

A:

Q: Given a sample with a mean of 57 and a standard deviation of 14, find x such that Pr(X < x) = 0.752.…

A: We have to find x for given data.

Q: Assume that z scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: Obtain the value of “a” if P(–a &lt; z &lt; a) = 0.4314. The value of “a” is obtained below as…

Q: A company pays its employees an average wage of $22.50 an hour with a standard deviation of $2.30.…

A: The z score is used to test the probability of normal distribution. It is also known as standard…

Q: A researcher finds that the mean income (in dollars per week) of a sample of people who live in a…

A: Given:

Q: Given a sample with a mean of 57 and a standard deviation of 14, find x such that Pr(X > x) = 0.184.…

A: It is given that the mean 57 and standard deviation 14. That is, µ= 57, σ = 14. Thus, X~ N (57, 14).…

Q: The mean weight of 500 male students at a certain college is 80 kg, and the standard deviation is 8…

A:

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P…

A: Obtain the value of b. The value of b is obtained below as follows:

Q: Let X represent the amount of gasoline (gallons) purchased by a randomly selected customer at a gas…

A: Given: Sample size, n = 50Mean, μ = 11.5 Std. Dev, σ = 4.0

Q: The Credit Risk Department of a major bank estimates the default rate on loans under $10,000 to be…

A: Introduction -Mean =μp^=pstandard deviation =pqnwhere , q=1-pn=sample sizep=proportion p^=estimated…

Q: An orange juice producer buys all his oranges from a large orange grove. The amount of juice…

A: Given: μ=4.7 and σ=0.4. d)From the given…

Q: The Credit Risk Department of a major bank estimates the default rate on loans under  $10,000  to be…

A: Givenpopulation proportion(p)=1%=0.01sample size(n)=1100

Q: A set of test scores has a mean of 27 and a standard deviation of 4.2. Calculate the raw scores for…

A: We have given that, A set of test scores has a mean of 27 and a standard deviation of 4.2   The…

Q: The residents of Toledo produce on average 600 pounds of solid waste each year, and the standard…

A: Obtain the weight range that contains at least 75% of all residents’ annual garbage weights.   The…

Q: A certain brand of laundry soap is advertised to have a net weight of 300 grams. If the average net…

A: Given : n=15 , X-bar=260  , s=28 , μ0=300 , α=0.01 Since , the population standard deviation (σ) is…

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: In a given year, the average annual salary of an NFL football player is $189,000 with a standard…

A:

Q: The Credit Risk Department of a major bank estimates the default rate on loans under $10.000 to be…

A:

Q: The Credit Risk Department of a major bank estimates the default rate on loans under $10,000 to be…

A: Given data, p=5%=0.05 n=1900

Q: The Credit Risk Department of a major bank estimates the default rate on loans under $10,000 to…

A: Given: p=2%=0.02n= 1600

Q: If P(−b<z<b)=0.98P(-b<z<b)=0.98, find b.

A: Given that Z ~ N(0, 1) And P(-b &lt; Z &lt; b) = 0.98

Q: The average student loan debt for collge graduates is$25,950. Suppose that that distribution is…

A:

Q: A recent study showed that the average number of sticks of gum a person chews in a week is 11. A…

A: Given information- Population mean, μ = 11 Sample size, n = 14 Sample mean, M = 10 Sample standard…

Q: 1. In the past, a chemical company produced 880 pounds of a certain type of plastic per day. Now,…

A: Given that  Sample size n =50 Sample mean =871 Standard deviation =21 Population mean μ =880

Q: An experiment is performed to determine whether the average nicotine content of one kind of…

A:

Q: According to a Human Resources report, a worker in the industrial countries spends on average 419…

A: Solution

Q: that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: Given: Z ~ N (0, 1) P (- 0.9 &lt; z &lt; b) = 0.5607

Q: suppose the average time to fill a routine prescription at a local pharmacy is 35 minutes based on…

A: Given data,Mean μ=35sd    σ=11x=48z=?

Q: Let the random variable X represent the profit made on a randomly selected day by a certain store.…

A:

Q: Given a sample with a mean of 151 and a standard deviation of 27, find x such that Pr(X < x) =…

A: From the given information we want to find the value of X.

Q: Find P(11<X<15) If X is normally distributed with a mean of 14 and a standard deviation of 2?

A:

Q: Given a sample with a mean of 151 and a standard deviation of 27, find x such that Pr(X > x) =…

A:

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A:

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.