To analyze phone users your team randomly selects 16 individuals. The sample average is $1,100. The...
To analyze phone users your team randomly selects 16 individuals. The sample average is $1,100. The sample standard deviation is $400. Find the 95% confidence level for the average phone price. How do you interpret it?
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To analyze phone users your team randomly selects 16
individuals. The sample average is $1,100. The...
You are hired by Google to research how much people are willing to pay for a...
You are hired by Google to research how much people are willing to pay for a new cell phone in US. They are especially interested to know if their new phone, Pixel, should be priced similarly to Apple’s iPhone. Google believes that there is a difference between what Android and iPhone users are willing to pay for high-end phones. You are hired to answer this question. To analyze iPhone users your team randomly selects 16 individuals. The sample average for...
A student randomly selects 16 DVD’s at a store. The prices of the DVD’s have a...
A student randomly selects 16 DVD’s at a store. The prices of the DVD’s have a standard deviation of $2.25. Construct a 95% confidence interval for the population standard deviation. Assume the data are normally distributed.
Now assume that instead of a sample of 365 kindergarten students, your sample consisted of 16...
Now assume that instead of a sample of 365 kindergarten
students, your sample consisted of 16 randomly selected kids. Find
the 95% confidence interval of the mean for all kindergarteners in
the US.
A study of 365 randomly-selected kindergarten students across the US revealed that they had seen an average of 3000 hours of television. If the standard deviation is 300, us distribution find the 95% confidence interval of the mean for all kindergarteners in the U 5) e the...
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16...
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of phone calls is 220)...
23. The national average SAT score (for Verbal and Math) is 1019. If we assume a...
23. The national average SAT score (for Verbal and Math) is 1019. If we assume a normal distribution with o= 100, a. what SAT score is in the 85th percentile? b. what is the probability that a randomly selected score exceeds 1200? 26. Ten randomly selected people were asked how long they slept at night. The mean time was 7.1 hours, and the standard deviation was 0.78 hour. Assume that the data is normally distributed a. For a 95% confidence...
Example 3) Suppose you want to study if female Facebook users have more friends on Facebook...
Example 3) Suppose you want to study if female Facebook users have more friends on Facebook on average than male Facebook users. To do this you first divide the country into four regions, West Coast, East Coast, Midwest, and South. Then you randomly sample men and women from all four regions and pool them together to make your two samples. Ultimately, you end up sampling 120 female Facebook users and 150 male Facebook users. You find that the female Facebook...
Justin is interested in buying a digital phone. He visited 16 stores at random and recorded the price of the particular...
Justin is interested in buying a digital phone. He visited 16 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 262.49 and a standard deviation of 27.57. A) What t-score should be used for a 95% confidence interval for the mean, μ, of the distribution? t* = (____) B) Calculate a 95% confidence interval for the mean price of this model of digital phone: (Enter the smaller value...
6. (A) The information obtained from a random sample of 1,600 users of the Arctic Power...
6. (A) The information obtained from a random sample of 1,600 users of the Arctic Power Tires yielded a mean useful life of 251,000kms and a standard deviation of 30,000kms. (a) Test the hypothesis that the mean lifetime L of this make of tire is not significantly different from 250,000kms. Let o = 0.05. Assume that the useful life L is a normally distributed random variable. (b) The following is an interesting and useful way of finding an approximate (1-—o)100%...
A random sample of 85 students finds that they, on average, they get 6.5 hours of...
A random sample of 85 students finds that they, on average, they get 6.5 hours of sleep a night, with a sample standard deviation of 7 hours. Would you use the z-distribution or the t-distribution to construct a confidence interval? How do you know? Construct a 95% confidence interval for the population mean. How do you interpret this interval? Is it likely that students actually get 7 hours of sleep a night? How can you tell?
What is the average age of students who live off campus? A random sample of 51...
What is the average age of students who live off campus? A random sample of 51 students shows the mean of 21.7 years and the standard deviation 2.5 years. Use a 95% level of confidence. a. What is the population parameter to estimate? b. What is the sample statistic? c. Find a 95% confidence interval for population parameter. d. Interpret your interval in the context. e. Melinda assumes that students who live off campus, on average, are older than 25....
Now assume that instead of a sample of 365 kindergarten
students, your sample consisted of 16 randomly selected kids. Find
the 95% confidence interval of the mean for all kindergarteners in
the US.
A study of 365 randomly-selected kindergarten students across the US revealed that they had seen an average of 3000 hours of television. If the standard deviation is 300, us distribution find the 95% confidence interval of the mean for all kindergarteners in the U 5) e the...
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of phone calls is 220)...
23. The national average SAT score (for Verbal and Math) is 1019. If we assume a normal distribution with o= 100, a. what SAT score is in the 85th percentile? b. what is the probability that a randomly selected score exceeds 1200? 26. Ten randomly selected people were asked how long they slept at night. The mean time was 7.1 hours, and the standard deviation was 0.78 hour. Assume that the data is normally distributed a. For a 95% confidence...
Example 3) Suppose you want to study if female Facebook users have more friends on Facebook on average than male Facebook users. To do this you first divide the country into four regions, West Coast, East Coast, Midwest, and South. Then you randomly sample men and women from all four regions and pool them together to make your two samples. Ultimately, you end up sampling 120 female Facebook users and 150 male Facebook users. You find that the female Facebook...
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