What is the excel formula for this? A simple random sample of 60 items resulted in a sample average of 80. The population standard deviation is sigma=15. What is a 99% Confidence Interval for the population mean?

Q: A researcher found a 95% confidence interval for the proportion of college students who believe in…

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Q: How large a sample should be selected to provide a 90% confidence interval with a margin of error of…

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Q: A sample of 60 people who were chosen for a sample had an average IQ score of 105. If the population…

A: From the given, x¯ (mean IQ score from sample)=105n (sample size)=60σ (population SD of IQ…

Q: A 90% confidence interval for the population mean is (Use ascending order. Round to two decimal…

A: Let  be the population mean number of months of work experience.Given that,Sample size Sample mean…

Q: A study found the temperature of 125 randomly selected healthy adults averaged 98.25 F with a…

A: It is given that sample mean is 98.25 and standard deviation is 0.733.

Q: A sample of 25 observations is taken from a normal distribution with unknown mean. The sample mean…

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Q: A group of 65 randomly selected students have a mean score of 30.6 with a standard deviation of 5.4…

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Q: A random sample of 110 Americans was asked how many hot dogs they eat each year.  The sample mean…

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Q: For a population with a standard deviation of 20, what is the zscore corresponding to a score that…

A: The population standard deviation is 20. The z-score corresponding to a score that is 5 points below…

Q: Overweight Men For a random sample of 70 overweight men, the mean of the number of pounds that they…

A: The sample size is 70, the sample mean is 29 and the population standard deviation is 4.3.

Q: You draw a simple random sample of 27 items from a Normal Population that has a standard deviation…

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Q: A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific…

A: We ignore million while calculation.

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: Suppose that we conduct a survey of 19 millionaires to find out what percent of their income the…

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Q: random sample of 36 people in Edirne city was asked how much their monthly income was. The sample…

A: Given: Sample size (n) = 36 Sample standard deviation (s) = 1200 Sample mean x¯=16000 Confidence…

Q: Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of…

A: given data s = 10.2 n = 22 90% CI for σ = ? α = 1 - 0.90 = 0.10df = n - 1 = 21χ2L = χ21-α2,n-1…

Q: Suppose we gather a random sample of 20 data points. Assume the population standard deviation is 11.…

A: Given,   Sample size = 20 Sample mean = 23 Population standard deviation = 11   Since the population…

Q: A group of 59 randomly selected students have a mean score of 29.5 with a standard deviation of 5.2…

A: It is given that n=59, x=29.5 and s=5.2. The value of z at 90% confidence interval is 1.645.

Q: You draw a simple random sample of 27 items from a Normal Population that has a standard deviation…

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Q: The average score for 49 teenage boys playing a certain computer game was 80,000 points per player.…

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Q: A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard…

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Q: You would like to estimate the variance of sick days at a Fortune 500 company.  You randomly select…

A: Given sample size n = 15degree of freedom = n - 1 = 15 -1 = 14sample standard deviation = 1.2sample…

Q: For a 95% confidence interval and n=21 give the Chi-squared right value.

A: From the provided information, Sample size (n) = 21 Confidence level = 95% The level of significance…

Q: ores on a standarized exam are known to follow a normal distribution with a standard deviation of 5.…

A: given data, normal distribution σ=5n=25x¯=72CI=0.88α=1-0.88=0.12

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.