Assume that the hay fever rate in each age group has an approximately normal distribution. Do the data indicate that the age group over 50 has a lower rate of hay fever? Use a = 0.05 State the null and alternate hypotheses.

Q: Of a large group of men 5 per cent are under 60 inches in height and 40 per cent are between 60 and…

A:

Q: Given a normal distribution with mean of 67 and standard deviation of 5, the probability that X…

A: We have given that,  X be the random variable from normal distribution ,  Then, We have to check…

Q: Carry out an appropriate statistical test to determine if the variable D follows a Normal…

A: Consider, the mean and standard deviation values for the given values: Consider, the expected…

Q: Which describes a normal distribution with mean μ and variance o²?

A: here use basic of normal distribution curve

Q: Use the normal distribution of IQ​ scores, which has a mean of 105 and a standard deviation of 13​,…

A: GivenMean(μ)=105standard deviation(σ)=13

Q: For the standard normal curve, what percentage of data is located between ¥-2 0 and ¥+20?

A: Note: Thank you for the question. Since notations are not clear to us, we have considered it as μ-2σ…

Q: given a normal distribution curve, what is the area below a z-score of -1.2?

A: Given that, The z-score value is -1.2.

Q: For a standard normal curve, find the probability a value has a z-score less than -2.

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

Q: Which of the following is closest to the shaded area under the normal distribution curve shown?

A: The area under the curve is less than 2 standard deviations away from the mean. Thus, around 97.5%…

Q: For a normal distribution, the first quartile corresponds with the 25th percentile.   A.) True B.)…

A:

Q: Given a normal distribution with mean = 100 and standard deviation = 10, what is the probability…

A: The distribution of X is a normal distribution as follows X~N(100, 10)

Q: The tensile strength of paper is modeled by a normal distribution with a mean of 36 pounds per…

A:

Q: Suppose the random variable xx has a normal distribution with μ=300μ=300 and σ=30σ=30. Find the…

A: Given: μ=300, σ=30.

Q: For a standard normal distribution, find: P(Z < 2.11)

A: The standard normal variable is z, which follows the normal distribution with the mean of 0 and…

Q: For a normal distribution with a mean of μ = 70 and a standard deviation of σ = 10, find the…

A: (a) Obtain the proportion of the population scores greater than 80. The proportion of the population…

Q: Consider a one-sample hypothesis test of the mean of a normal distribution. Which of the following…

A: type one error (α)=P(reject H0/H0 is true)type two error (β)=P(accept H0/H1 is true)power of…

Q: Assuming a normal distribution, for a sample with M-40 and s=4, about 95% of the individuals will…

A: 32 and 48

Q: . Carry out an appropriate statistical test to determine if the variable D follows a Normal…

A: Consider, the mean and standard deviation values for the given values: L U Midpoint, x f x*f…

Q: For a standard normal distribution, find: P(z > 2.6). Keep four decimal places.

A: By using standard normal distribution table:  P(z &gt; 2.6). Keep four decimal places is:

Q: If a distribution is normal with μ = 60 and σ = 15, what is the z score of 40?

A:

Q: If P(Z>z1)=D0.10 in the standard normal distribution, which of the following is the closest value…

A: P(Z&gt;z1)=0.10 z1=?

Q: given a normal distribution with mean of 40 and standard deviation of 6, find

A:

Q: given a standardized normal distribution with a mean of 0 and a standard deviation of 1 as in table…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: A normal distribution is defined by two parameters, the mean and the __________. mode standard…

A: A normal distribution is defined by two parameters.

Q: Assume that X is a random variable with a normal distribution. if the mean is 17 with a standard…

A:

Q: Given a normal distribution with μ=45 and σ=5​   For this​ distribution, 9​% of the values are…

A:

Q: For a normal distribution, the mean is equal to the median. True False

A: The Normal distribution is Symmetric distribution. So,  Mean = Median = Mode.

Q: Given a standard normal distribution (with a mean of 0 and a standard deviation of 1) what is the…

A:

Q: Suppose Z has a standard normal distribution. According to the empirical rule, what is P(-2<Z<1)…

A: According to the empirical rule,

Q: Assume that ex has a normal distribution with a specify mean and standard deviation mean =18…

A: Obtain the standard z-score for the random variable X equals 30. The standard z-score for the…

Q: for a normal distribution with a mean of 7 and a stanard deviation of 6, the value 10 has a z value…

A: It is given that mean and standard deviation are 7 and 6, respectively.

Q: Assuming the distribution of the above scores is normal, the percentage o people who scored within 1…

A: Let z be the random variable follows normal distribution

Q: Given a normal distribution with mean equal to 30 and standard deviation of 6, find the normal curve…

A: The mean of the data is 30. The standard deviation of the data is 6.

Q: For a normal distribution with a mean of μ=85and a standard deviation of σ=20, find the proportion…

A:

Q: For a normal distribution, find the percentage of data that are: (a)  Within 1 standard deviation…

A: The mean and standard deviation of the standard normal distribution are 0 and 1.

Q: Find the number z such that the proportion of observations that are less than z in a standard Normal…

A: To determine the real number z such that the probability  P(X&lt;z) = 0.5, where X is the random…

Q: For a normal distribution with a population of  μ = 54 and a standard deviation of σ = 12, find the…

A:

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

A: From the given information,   Mean = 20 Standard deviation = 3

Q: In a log normal distribution. What is the expected value of the mean and the Std. And what is the…

A: The mean and standard deviation of log normal distribution is to be found out. The log normal…

Q: Assume that we have two normal distributions both with means 0 and standard deviations σ1 and σ2. If…

A: We are given two normal distributions with mean = 0 and standard deviations σ1 and σ2.

Q: Given a normal distribution with mean of 67 and assumes a value less than 50 is 0.0034.

A:

Q: Given a normal distribution with mean 100 and standard deviation​ 10, find the area under the normal…

A:

Q: Suppose that the value of stock varies each day from $14 to $25 with a uniform distribution. Find…

A: Let, X = Value of stock X~Uniform(14, 25) The probability density function of X is given by;…

Q: Given a normal distribution with mean of 80 and standa assumes a value greater than 76 is 0.3085.

A:

Q: A z-score that is 9 points above the mean corresponds to a z = 1.50. What is the populations'…

A: Z score is the distance of data point from its mean in terms of its standard deviation. It is…

Q: In a standard normal distribution 95% of the data is within +/- _______standard deviations of the…

A: In a standard normal distribution 95% of the data is within +/- _______standard deviations of the…

Q: Consider a normal distribution curve where 55-th percentile is at 11 and the 20-th percentile is at…

A:

Q: In a standard normal distribution, the range of values of z is from

A: For above 5. ASWSBE14 6.TB.2.015 The range of values of z is always between minus infinity and…