Recent study stated that if a person chewed gum, the average number of sticks of gum...
Homework Answers
Since the confidence interval don't contain 8 , so we reject the claim and we can't conclude that the average number of sticks of gum he or she chewed daily is 8.
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Recent study stated that if a person chewed gum, the average number
of sticks of gum...
Recent study stated that if a person chewed gum, the average number of sticks of gum...
Recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per day was 9. The standard deviation of the population is 1. What would your conclusion be if the p-value of the test is equal to 0.00?
A recent study found that the average life expectancy of a person living in Africa is...
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a group of 40 people were selected at random, the probability that their mean life expectancy is less than 55 is?
A researcher found that a cigarette smoker smokes on average 31 cigarettes a day. She feels...
A researcher found that a cigarette smoker smokes on average 31 cigarettes a day. She feels that this average is too high. She selected a random sample of 15 smokers and found that mean number of cigarettes they smoked per day was 28. The sample standard deviation was 2.4. At Alpha αequals 0.05 is there enough evidence to support her claim?Assume that the population is approximately normally distributed.
A study of peach trees found that the average number of peaches per tree was 525....
A study of peach trees found that the average number of peaches per tree was 525. The standard deviation of the population is 105 peaches per tree. A scientist wishes to find the 95% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to obtain an average accurate to within 10 peaches per tree? Hint: Round n up the nearest whole number.
According to a study, children ranging from ages 8 to 18 averaged 7.9 hours per day...
According to a study, children ranging from ages 8 to 18 averaged 7.9 hours per day using electronic media. Assume the population standard deviation is 2.2 hours per day. A random sample of 45 children from this age group was selected, with a sample average of 8.7 hours of electronic media use per day. Complete parts a and b below a. Is there support for the claim of the study using the criteria that the sample average of 8.7 hours...
Confidence Intervals using the one-sample t-statistic A researcher was interested in estimating the average number hours...
Confidence Intervals using the one-sample t-statistic A researcher was interested in estimating the average number hours of sleep of her graduate statistics students. The researcher obtained a random sample of 6 graduate statistics students and asked them the number of hours of sleep. She then calculated a 95% confidence interval to estimate the population average number of hours of sleep The data appear in the table below. Hours of sleep 19 21 21 30 21 20
In a recent study of 66 six-month-old infants, the average amount of sleep per day was...
In a recent study of 66 six-month-old infants, the average amount of sleep per day was 15 hrs. The population SD of the amount of sleep per day was 6 0.5 hrs. Find a 99% confidence interval for the average amount of sleep per day, among those infants
A researcher is interested in finding a 95% confidence interval for the mean number of times...
A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 141 students who averaged 25.7 texts per day. The standard deviation was 21.2 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a tv distribution. 0 and b. With 95% confidence the population mean number of texts per day is between texts. c. If many groups of 141...
A study reports that recent college graduates from New Hampshire face the highest average debt of...
A study reports that recent college graduates from New Hampshire face the highest average debt of $31,321 (The Boston Globe, May 27, 2012). A researcher from Connecticut wants to determine how recent undergraduates from that state fare. He collects data on debt from 40 recent undergraduates. A portion of the data is shown in the accompanying table. Assume that the population standard deviation is $5,300. [You may find it useful to reference the z table.] Debt 24, 044 19,150 26,759...
A survey taken several years ago found that the average time a person spent reading the...
A survey taken several years ago found that the average time a person spent reading the local daily newspaper was 10.8 minutes. The standard deviation of the population was 3 minutes. To see whether the average time had changed since the newspaper's format was revised, the newspaper editor surveyed 36 individuals. The average time that the 36 people spent reading the paper was 12.2 minutes. (a) At α = 0.02, is there a change in the average time an individual...
According to a study, children ranging from ages 8 to 18 averaged 7.9 hours per day using electronic media. Assume the population standard deviation is 2.2 hours per day. A random sample of 45 children from this age group was selected, with a sample average of 8.7 hours of electronic media use per day. Complete parts a and b below a. Is there support for the claim of the study using the criteria that the sample average of 8.7 hours...
In a recent study of 66 six-month-old infants, the average amount of sleep per day was 15 hrs. The population SD of the amount of sleep per day was 6 0.5 hrs. Find a 99% confidence interval for the average amount of sleep per day, among those infants
A researcher is interested in finding a 95% confidence interval for the mean number of times per day that college students text. The study included 141 students who averaged 25.7 texts per day. The standard deviation was 21.2 texts. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a tv distribution. 0 and b. With 95% confidence the population mean number of texts per day is between texts. c. If many groups of 141...
A study reports that recent college graduates from New Hampshire face the highest average debt of $31,321 (The Boston Globe, May 27, 2012). A researcher from Connecticut wants to determine how recent undergraduates from that state fare. He collects data on debt from 40 recent undergraduates. A portion of the data is shown in the accompanying table. Assume that the population standard deviation is $5,300. [You may find it useful to reference the z table.] Debt 24, 044 19,150 26,759...
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