# (population) A normal distribution has a mean of 80 and a std dev of 20. For each of the following scores, indicate wheter the tail of the distribution is located to the right or left of the score, and find

13,494 results
1. ## math

Conditioned on the result of an unbiased coin flip, the random variables T1,T2,…,Tn are independent and identically distributed, each drawn from a common normal distribution with mean zero. If the result of the coin flip is Heads, this normal

2. ## stat

Which of the following statements is true about the t-distribution with k degrees of freedom? i. the t-distribution is symmetric ii. the t-distribution with k degrees of freedom has a smaller variance than the t-distribution with k+1 degrees of freedom

3. ## Statistics mit

As on the previous page, let X1,…,Xn be i.i.d. with pdf fθ(x)=θxθ−11(0≤x≤1) where θ>0. (a) 2 puntos posibles (calificables, resultados ocultos) Assume we do not actually get to observe X1,…,Xn. Instead let Y1,…,Yn be our observations where

4. ## statistics

Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has normal ditribution, the mean and the median are not equal. d. The

5. ## Stats Math 3

Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) Describe the sampling

6. ## Statistics

The t distribution should be used when ___. the sampling population is not normal the sampling population is unimodal The sampling distribution is normal and the population standard deviation is unknown the population standard deviation is known

7. ## Probability

Let T1,T2,…,Tn be i.i.d. observations, each drawn from a common normal distribution with mean zero. With probability 1/2 this normal distribution has variance 1, and with probability 1/2 it has variance 4. Based on the observed values t1,t2,…,tn, we

8. ## Statistics

3. As on the previous page, let X1,…,Xn be i.i.d. with pdf F_θ(x)= θx^θ-1*1(0

9. ## stat

Construct a 90% confidence interval for the population mean. Assume the population has a normal distribution. A same of 15 randomly selected math majors has a grade point average of 2.86 with a standard deviation of 0.78. Round to the nearest hundredth.

10. ## Statistics

You are interested in estimating the mean of a population. you plan to take a random sample from the population and use the samples mean as an estimate of population mean. Assuming that the population from which you select your sample is normal, which of

11. ## statistics

The distribution of scores on the SAT is approx. normal with mu= 500 and std dev=100. a)what proportion of the population have SAT scores above 650? b)what proportion of of the population have SAT scores below 540? c)what is the minimum SAT score needed to

12. ## Statistics

A mathematically defined curve that is the comparison distribution used in ANOVA is called the: - Normal distribution - Chi Square distribution - F distribution - T distribution

13. ## Math (Statistic)

Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling distribution related to the

14. ## statistics

Suppose X has a mound-shaped distribution with sigma=9. A random sample of size 36 has a sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean u?

15. ## Statistics 1 plaese give answers to below question

Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) Describe the sampling

16. ## statistics

A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. For the hypothesis, H0: ¦Ì1 ¡Ü ¦Ì2, (.01 significance level), what is (are) the critical value(s)? (Population standard

17. ## statistics

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. (True/False) b. The graph of a normal distribution is bell-shaped. (True/False) c. If a population has a normal distribution, the mean and

18. ## Statistics

Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

19. ## STAT- important

What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when

20. ## Statistics

As the degrees of freedom for the t-distribution increase, the distribution approaches the value of zero for the mean. the t-distribution. the normal distribution. the F distribution.

21. ## Statistics

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal.

22. ## Statistics

Which of the following statements are correct? 1.A normal distribution is any distribution that is not unusual. 2.The graph of a normal distribution is bell-shaped. 3.If a population has a normal distribution, the mean and the median are not equal. 4.The

23. ## statistics

A simple random sample of size n = 300 is obtained from a population whose size is and whose population size is n=20,000 ans whose proportion with a specified characteristic is p=0.8. Describe the sampling distribution of P^. A) Approximately normal; ìp =

24. ## AP Statistics

When finding a confidence interval for a population mean based on a sample of size 11, which assumption is made? The standard deviation is fixed. The sampling distribution of z is normal. The sampling distribution of the sample means is approximately

25. ## Statistics

If you have a curve with an asymmetric bimodal distribution, is it considered a normal distribution? Or is it only a normal distribution if there is a single bell-shaped curve?

26. ## statistic

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal.

27. ## statistics

Which of the following statements are correct? a. a normal distribution is any distribution that is not unusual b. the graph of a normal distribution is bell-shaped c. if a population has a normal distribution, the mean and the median are not equal d. the

28. ## Statistics

Trying to finish an assignment: What happens to the power of the z test when the standard deviation increases? and Is the shape of a sampling distribution always the same as that of the null hypothesis population? Thanks! As the SD increases, the exactness

29. ## stats

(a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The distribution is Normal because the

30. ## stats

(a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The distribution is Normal because the

31. ## Statistics

What is the difference between the population distribution, the distribution of the same, and the sampling distribution and what are the formulas to get the normal distribution of each?

32. ## res342

In conducting research that looks at differences in populations, samples are used for numerous reasons. Using entire populations in a test is difficult, so various sampling techniques are applied. In situations in which the population variance is unknown,

33. ## statistics

Suppose we take a random sample of size n from a normal population with variance, σ2 . It can be shown that (n−1)s2/σ2 has a chi-square distribution with n−1 degrees of freedom, where s is the sample variance. Below is a random sample of size 8 drawn

34. ## Statistics

Find an example of application of Normal Distribution (or approximately Normal Distribution) in your workplace or business (or any other business that you are familiar with). Prove that the variable has the characteristics of a Normal Distribution. Recall

35. ## Stats

When making a decision on whether a sample mean is significantly different than a population mean given that you sampled a small sample (n), what is the correct reasoning for choosing the t-distribution over the standard normal distribution

36. ## Stats

A bottling company uses a filling machine to fill glass bottles with mango juice. The bottles are supposed to contain 300 milliliters (ml). In fact the amounts vary according to a normal distribution with mean = 298 and standard dev = 3 ml. What is the

37. ## stats

the distribution of IQscores forms a normal distribution with a mean of 100 and a standard deviation of 15. what is the proportion of the population that has an IQscore greater than 130?

38. ## Math!!!

Suppose Y ∼ N(μ=0, σ). Find σ so that the normal population contains 90% of its probability between -1 and 1. Please round your answer to two decimals. . [Hint: The normal distribution is symmetric around 0, so you can simplify the problem and only

39. ## statistics

mu=78 population std deviation=12 Normal Distribution n=16 alpha level=.05 * compute the power of the hypothesis test if the program has a 3-point effect. I came up with 83.88 % * compute the power of the hypothesis test if the program has a 6-point

40. ## statistics

Build a 95% confidence interval for the mean of the population from the given sample data. Assume that the population has a normal distribution. 16.4, 15.7, 16.2, 15.8 17.1 15.8, 15.9, 16.0, 16.4 15.0 *please help me solve this! I have no clue what I am

41. ## Statistics

Suppose that the probability distribution of a random variable x can be described by the formula P(x) = x/15 For each of the values x = 1, 2, 3, 4, and 5. For examples, then, p(x=2) = p(2) = 2/15 a Write out the probability distribution of x. b Show that

42. ## Probability

Let T1,T2,…,Tn be i.i.d. observations, each drawn from a common normal distribution with mean zero. With probability 1/2 this normal distribution has variance 1, and with probability 1/2 it has variance 4. Based on the observed values t1,t2,…,tn, we

43. ## Statistics

Suppose that the probability distribution of a random variable x can be described by the formula P(x) = x/15 For each of the values x = 1, 2, 3, 4, and 5. For examples, then, p(x=2) = p(2) = 2/15 a Write out the probability distribution of x. b Show that

44. ## Statistics

What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when

45. ## AP Statistics

As the degrees of freedom for the t-distribution increase, the distribution approaches the value of zero for the mean. the t-distribution. the normal distribution. the F distribution. I'm thinking C...

46. ## famu

Construct a 99% confidence interval for the population mean, ì. Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard deviation of 3.8 years. Round to the nearest tenth.

A) Choose one of the following distributions (positively skewed normal distribution, negatively skewed normal distribution or bimodal normal distribution) and generate a sample of 20 numbers for it. The sample you generate should have a mean of 8 and a

48. ## statistics

A normal distribution has a standard deviation equal to 23. What is the mean of this normal distribution if the probability of scoring above x = 181? record to 1 decimal place

49. ## Statistics

How do I answer: A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228

50. ## finance

Based on the following information, calculate the coefficient of variation and select the best investment based on the risk/reward relationship. Std Dev. Exp. Return Company A 10.4 15.2 Company B 14.6 22.9

51. ## Statistics

Given a population with a normal distribution, a mean of 100, and a standard deviation of 1, what value has an area of .1234 to its right?

52. ## statistics, math, college

if np >5 and nq>5 estimate P (fewer than 4) with n=13 p=0.4 by using normal distribution as an approximate to the binomial distribution if np

53. ## statistics

(population) A normal distribution has a mean of 80 and a std dev of 20. For each of the following scores, indicate wheter the tail of the distribution is located to the right or left of the score, and find the proportion of the distribution located in the

54. ## Statisitcs

How do I find the value of the mean, when I am only given the std dev of a normal distribution and a percentage of values greater than another value.

55. ## human risk assessment

Calculate the average daily dose (ADD) for each route of exposure. Parameter Average Units Distribution TCE concentration in water 225 ug/L Uniform 183 - 267 ug/L Water intake 0.87 L/day Normal Mean: 0.87 L/day 95th percentile: 2 L/day TCE concentration in

56. ## Statistics

Males make a mean of 531 on math SAT with standard deviation of 114. Minimum 600 score. what's the % of males that don't satisfy this requirement? Pregnancies usually distributed mean of 268 days and standard distribution 15 days. Baby born three week

57. ## statistics

which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d.

58. ## Stats formula

i have a hard time figuring out which formula's to use when solving problems. which would i use for the following: if X is a normal random variable with mean u=60 and a Std Dev.=2 find: A. p(x63) C. p(57

59. ## statistics

A bank loan officer rates applicates for credit. The rating are normally distributed with a mean of 200 and a standard deviation of 50. Find the P60, the score which separates the lower 60% from the top 40%. I get 212.7, using the normal distribution tool

60. ## Stats

The incomes in a certain lg. population of college teachers have a normal distribution with a mean of \$35,000 and st. dev. of \$5000. Four teachers are randomly selected. What is the probability their average salary will exceed \$40,000?

61. ## statistics

Write a brief paragraph describing the distribution of the variables, Population in thousands (populatn) and the average female life expectancy (lifeexpf) for the countries. Descriptive Statistics Population in thousands Average female life expectancy

62. ## BioStats

An observational study is conducted to investigate the association between age and total serum cholesterol. The correlation is estimated at r = 0.35. The study involves n=125 participants and the mean (std dev) age is 44.3 (10.0) years with an age range of

using a=0.05, test for mean 1 greater than mean 2. group n mean std dev. 1 30 13.5 1.1 2 30 12.0 1.2

64. ## statistics

the five number summary of the distribution of scores on a statistics exam is 0 26 31 36 50 316 students took the exam. the histogram of all 316 scores was approximately normal. Thus the variance of test scores must be about I know about subtracting 26-31

65. ## Statistics

Find the 99% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

66. ## math check

Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

67. ## math

Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

68. ## Statistics

Kind attention Psydag: A random sample of size 20 from a normal population with sample mean 42 and sample standard deviation of 6 . To test the hypothesis the population mean 44 at 5% level of significance , find the p-value and comment Clarification: The

69. ## Statistics

True or false: as then number in the sample becomes larger and larger (assuming it means as the sample gets larger and larger), then the mean of the sampling distribution is equal to the population distribution for any normal population. Is it false? That

70. ## Math

True or false: as then number in the sample becomes larger and larger (assuming it means as the sample gets larger and larger), then the mean of the sampling distribution is equal to the population distribution for any normal population. Is it false? That

71. ## Stats

A simple random sample of size n equals=3737 is obtained from a population with μ equals=6969 and σ equals=1515. ​(a) What must be true regarding the distribution of the population in order to use the normal model to compute probabilities involving the

72. ## statistics

Assume the population distribution of FEV is normal with standard deviation 400 mLi. (a) find P(E) is n=15 and population mean is 2800 mLi (B) find P(E) is n=15 and the population mean is 2600mLi (C) How does P(E) depend on the population mean?

73. ## statistics

Build a 95% confidence interval for the mean of the population from the given sample data. Assume that the population has a normal distribution. 16.4, 15.7, 16.2, 15.8 17.1 15.8, 15.9, 16.0, 16.4 15.0

74. ## Statistics

The population of males’ heights can be represented using the normal distribution curve. You are given that the mean height of Males is 174cm and the standard deviation is 5cm. The population of females’ heights can be represented using the normal

75. ## Statistics

Is there a rule to figure out if this is a true or false statement? A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.

76. ## Statistics

When finding a confidence interval for a population mean based on a sample of size 11, which assumption is made? The standard deviation is fixed. The sampling distribution of z is normal. The sampling distribution of the sample means is approximately

77. ## Statistics formula

Which stats formula would i use for the following: Using the following computer output and a=0.05, test for equal means. group n mean std dev 1 10 77.4 16.4 2 12 68.8 15.2 test u1=u2 (VS NE) t=1.29 p=0.21

78. ## stats

salary study conducted. mean for men = \$42,000. Std deviation = \$9,000. mean for women = \$39,000. Std dev for women = 8,000. If 100 men surveyed, at a CI of 95% what is the the most number of women surveyed if there was no Statistical difference in the

79. ## Statistics

A bottling company uses a filling machine to fill glass bottles with mango juice. The bottles are supposed to contain 300 milliliters (ml). In fact the amounts vary according to a normal distribution with mean = 298 and standard dev = 3 ml. What is the

80. ## Statistics

Need help! A normal distribution with a mean of 20 and a standard deviation of 2 is evaluated to solve a business problem. What is the probability that the value in the population is between 20 and 30? What is the probability that any value in the

81. ## statistics

Suppose a population distribution of SAT scores has population mean 500 and population standard deviation 100. What is the mean of the sampling distribution of sample means, ybar , calculated from samples of size n = 36

82. ## Physical Chemistry

The equilibrium constant for a reaction was measured at several temperatures and the data plotted at right. The slope and y-intercept of the plot are +3.25 kK and -4.04, respectively. Calculate ΔrH(std), ΔrS(std), and ΔrG(std) using this information.

83. ## statstics

construct a 90 confidence interval for the population mean ÃŽ¼. assume the population has a normal distribution. A sample if 15 randomly selected math majors has a grade point average of 2.86 with a standard deviation od 0.78. Round to the nearest

84. ## math

We use the normal distribution to make estimates about a population.t or f

85. ## STATS Math

Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) describe the sampling

86. ## Statistics

the scoring of IQ tests is designed so that the scores of the test taking population are normally distributed with a mean of 100 and a standard dev of 15. what percent of the population have an IQ less than 92? how do i figure this out?

87. ## AP Statistics

12) Which of the following statements is true? a) The sampling distribution of the difference between two proportions will always be normal. b) When comparing two population proportions, either sample proportion can be used as the unbiased estimate of the

88. ## Statistics

Suppose that, in fact, the blood cholesterol level of all men aged 20 to 34 follows the normal distribution with mean of u = 188 milligrams per deciliter (mg/dl) and standard deviation = 41 mg/dl. 1. Choose an SRS of 100 men from this population. What is

89. ## Behavioral Statistics Help!

The majority of the data is normally distributed if there are enough subjects. For instance, if you collected test scores of only a few honor students, the data will most likely not be normally distributed because you would have a sample that did not

90. ## statistics

Random samples of size n are selected from a normal population whose standard deviation is know to be 2. Suppose you want 90% of the area under the sampling distribution of x bar to lie within + or - 1 unit of a population mean u. Find the minimum sample

91. ## statistics

You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a reasonable approximation for the binomial distribution in this case. Find the critical value that corresponds to a confidence

92. ## Math

Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal places.) Sample Number Mean Std. Dev. 1 25 38.6 13.7 2 29

93. ## statistics

A random sample of n=36 scores is selected from a population. Will this have a definite normal distribution?

94. ## Statistics

two samples of data regarding salary of Co A and Co B determine if you can be 99% sure that Co? A makes more than Co B? Company A - Mean 55,000, Std Dev 5,000, Sample Size 200; Co B mean 52,000, Std Dev 3,000 Sample size 400 please show steps thanks

95. ## Stats-BOB PURSLEY Help, do you know this?

Is there a rule to figure out if this is a true or false statement? A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.

96. ## Statistic

In a population of over 15,000 patients, the distribution of systolic blood pressure follows the normal curve. Investigators believe the average systolic blood pressure in the population is 120 mm. The investigators take a simple random sample of 6

97. ## statistics

A consumer group wants to know if an automobile insurance company with thousands of customers has an average insurance payout for all their customers that is greater than \$500 per insurance claim. They know that most customers have zero payouts and a few

98. ## math help

Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

99. ## What is the best estimate of the population mean?

The Jolliebee hamburger chain specializes in half-pound hamburgers. The sales follow a normal distribution. The standard deviation of the distribution for daily sakes is \$3000. A sample of 40 showed the mean daily sale to be \$20,000. What is the best

100. ## Math

Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal places.) Sample Number Mean Std. Dev. 1 25 38.6 13.7 2 29