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Statistics Psychology

05/30/23

Describe what is measured by the estimated standard error in the bottom of the independent-measures t statistic

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Statistics Math

05/30/23

Math Homework for Statistics

Confidence Interval Confidence Level90%95%99%Critical Value z*1.6451.962.5765. Two-hundred and fifty randomly selected peopleare surveyed to determine if they own a tablet. Of the 250 surveyed, 98... more

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Statistics

05/30/23

Statistics, Delta Method, Central Limit Theorem

Let {X_n} be a sequence of random variables such that \sqrt{n}(X_n-\theta) converges in distribution to N(0,\sigma^2). The function g(x) is differentiable at theta and we have g'(\theta) eq 0,... more

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Statistics Probability

05/30/23

Suppose we have events A and B so that P(A)=0.3 and P(B)=0.4 Find P(A or B) if P(A|B)=0.2

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Statistics Probability

05/30/23

Sample size find

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=15%. You would like to be 90% confident that... more

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Statistics Probability

05/30/23

Can someone help me with these two?

You are interested in estimating the the mean weight of the local adult population of female white-tailed deer (doe). From past data, you estimate that the standard deviation of all adult female... more

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Statistics Probability

05/30/23

Construct confidence interval at 90% confidence

In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $42 and standard deviation of $13. Construct a... more

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Statistics Probability

05/29/23

Find Margin Error at 80% confidence level

In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47 and standard deviation of $5. Find the margin of... more

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Statistics Probability

05/29/23

Estimating population proportion HELP - Prob/stats

1) You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=30%. You would like to be 95% confident... more

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Statistics Probability

05/29/23

Solve for Sample Size - Prob/stats

You work for a marketing firm that has a large client in the automobile industry. You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. You have... more

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Statistics

05/29/23

central limit theorem

An unknown distribution has the following parameters: µx = 45 and σ x = 8 a sample size of 50 is drawn randomly from the population. Find the 80th percentile for the sum of the 50 values of x

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Statistics

05/29/23

Can you predict the number of situps a person who watches 7 hours of TV can do (to one decimal place)

A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y).The results of the regression... more

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Statistics

05/29/23

Central limit theorem

An unknown distribution has the following parameters: µx = 45 and σ x = 8 . a sample size of 50 is drawn randomly from the population. Find ΣX where z=-2

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Statistics

05/26/23

Need Stats help

In a recent year, the Better Business Bureau settled 75% of complaints they received. (Source: USA Today, March 2, 2009) You have been hired by the Bureau to investigate complaints this year... more

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Statistics

05/26/23

Find probability

Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 145 minutes with a standard deviation of 13 minutes. Consider 49 of the races.Let X = the... more

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Statistics Math

05/25/23

Math homework on statistics . 8 questions

Normal Curve 1. A set of data has a normal distribution withmean of 50 and a standard deviation of 5. Sketch and label a normal curve.2. Find the probability that a randomly selected x-value is... more

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Statistics Business

05/25/23

Business Statistics (1)

Business Statistics (1)Please refer below link for pdf questions.https://pdf.ac/w7cHN

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Statistics

05/24/23

Find the percentile

Normally distributed with a mean of 258 feet and a standard deviation of 56 feet. We randomly sample 49 baseballs.Find the 80th percentile of the distribution of the average 0f 49 baseballs. (round... more

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Statistics

05/24/23

Solve probability, percentile, and more

uppose that a category of world class runners are known to run a marathon (26 miles) in an average of 147 minutes with a standard deviation of 15 minutes. Consider 49 of the races.Let X = the... more

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Statistics

05/24/23

Find probability’

Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 145 minutes with a standard deviation of 13 minutes. Consider 49 of the races.Let X = the... more

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Answers •1

Statistics

05/24/23

Find percentile

Salaries for teachers in a particular elementary school district are normally distributed with a mean of $43,000 and a standard deviation of $6,100. We randomly survey 10 teachers from that... more

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Statistics Psychology

05/23/23

For a sample of n = 30 scores, a score that is 6 points above the mean has a z-score of z = 1.50. What is the sample standard deviation?

Please provide how to solve :)

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Statistics Psychology

05/22/23

What scale of measurement (i.e. ratio, nominal, etc.)

Rosenzweig, Bennett, and Diamond (1972) studied rats to determine whether an enriched environment could increase brain size. The rats were randomly assigned to one of three conditions: standard... more

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Statistics

05/22/23

normal distribution

Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 25 days and a standard deviation of 6 days.72% of all of these types of trials... more

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Statistics

05/21/23

Normal distribution

Terri Vogel, an amateur motorcycle racer, averages 129.71 seconds per 2.5 mile lap (in a 7 lap race) with a standard deviation of 2.28 seconds. The distribution of her race times is normally... more

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Answers •1

Describe what is measured by the estimated standard error in the bottom of the independent-measures t statistic

Math Homework for Statistics

Statistics, Delta Method, Central Limit Theorem

Suppose we have events A and B so that P(A)=0.3 and P(B)=0.4 Find P(A or B) if P(A|B)=0.2

Sample size find

Can someone help me with these two?

Construct confidence interval at 90% confidence

Find Margin Error at 80% confidence level

Estimating population proportion HELP - Prob/stats

Solve for Sample Size - Prob/stats

central limit theorem

Can you predict the number of situps a person who watches 7 hours of TV can do (to one decimal place)

Central limit theorem

Need Stats help

Find probability

Math homework on statistics . 8 questions

Business Statistics (1)

Find the percentile

Solve probability, percentile, and more

Find probability’

Find percentile

For a sample of n = 30 scores, a score that is 6 points above the mean has a z-score of z = 1.50. What is the sample standard deviation?

What scale of measurement (i.e. ratio, nominal, etc.)

normal distribution

Normal distribution

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