Question

In: Statistics and Probability

A researcher would like to determine whether a new tax on cigarettes has had any effect...

A researcher would like to determine whether a new tax on cigarettes has had any effect on people’s behavior. During the year before the tax was imposed, stores located in rest areas on the state thruway reported selling an average of µ = 410 packs per day with σ = 60. The distribution of daily sales was approximately normal. For a sample of n = 9 days following the new tax, the researcher found an average of M = 386 packs per day for the same stores.

a. Is the sample mean sufficient to conclude that there was a significant change in cigarette purchases after the new tax. Complete the 4 steps of hypothesis testing using a two-tailed test with α = .05. *Clearly write each step please

b. Calculate cohen's d and explain what it add to hypothesis testing.

Solutions

Expert Solution


orchestra answered 2 years ago
Next > < Previous

Related Solutions

A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on...
A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on mental alertness for infants. A sample of n = 18 infants is obtained, and each baby is given a standard dose of the spray one hour before being tested for mental alertness. For the general population of infants, scores on a mental alertness screening test are normally distributed with μ = 60. The infants in the sample had an average score of M =...
A researcher wants to determine whether or not a given drug has any effect on the...
A researcher wants to determine whether or not a given drug has any effect on the score of a human subject performing a task of ESP sensitivity. He randomly assigns his subjects to one of two groups. 900 subjects in group 1 (treatment group) receive the drug. In contrast, 1000 subjects in group 2 (control group) receive a placebo. For the drug group, the mean score on the ESP test was 15, SD=4. For the no-drug group, the mean =9,...
A researcher for a yogurt manufacturer would like to determine whether adult consumers showed any preference...
A researcher for a yogurt manufacturer would like to determine whether adult consumers showed any preference between two new yogurt products that the company recently developed, as one will be marketed as “organic” and the other without the organic designation. To start, a small sample of adults was obtained (n = 9), and on Day 1, given the organic yogurt to eat. The next day, the same 9 adults were given the non-organic yogurt to eat, with the same instructions...
1) A group of researchers would like to study the effect of electronic cigarettes (e-cigarettes) use...
1) A group of researchers would like to study the effect of electronic cigarettes (e-cigarettes) use on getting lung cancer. 500 subjects were randomly sampled from e-cigarettes users and 500 subjects were randomly sampled from non-users for monitoring. The incidence of lung cancer for the two groups are reported in the following contingency table. Lung Cancer No Lung Cancer e-cigarette Users 120 380 Non e-cigarette Users 50 450 Based on this sample, what is an estimated population risk ratio of...
A market researcher wants to determine whether a new model of a personal computer that had...
A market researcher wants to determine whether a new model of a personal computer that had been advertised on a​ late-night talk show had achieved more​ brand-name recognition among people who watched the show regularly than among people who did not. After conducting a​ survey, it was found that 16​%of all people both watched the show regularly and could correctly identify the product.​ Also,20​% of all people regularly watched the show and 45​%of all people could correctly identify the product....
A psychologist would like to determine whether there is any consistent relationship between intelligence and creativity.  The...
A psychologist would like to determine whether there is any consistent relationship between intelligence and creativity.  The psychologist obtains a random sample of n = 18 people and administers a standardized IQ test and a creativity test to each individual.  Using these data, the psychologist obtains a Pearson correlation of r = +.20 between IQ and creativity. a.  Do the sample data provide sufficient evidence to conclude that a real (non-zero)      correlation exists in the population?  Test at the .05 level of significance. b.  If...
A researcher is evaluating whether an increase in the minimum hourly wage had an effect on...
A researcher is evaluating whether an increase in the minimum hourly wage had an effect on employment in manufacturing industry in the following three months. Taking a sample of 25 firms, 1. [3 points] what should she conclude if the mean decrease in employment is 9 percent and the standard error of the mean is 5 percent (use 5% significance level)? 2. [3 points] what should she conclude if the mean decrease in employment is 12 percent and the standard...
A study was conducted to determine whether an expectant mother’s cigarette smoking has any effect on...
A study was conducted to determine whether an expectant mother’s cigarette smoking has any effect on the bone mineral content of her otherwise healthy child. A sample of 24 newborns whose mothers smoked during pregnancy has mean bone mineral content (x_1 ) ̅=0.098 g/cm and s_1=0.026 g/cm; a sample of 38 infants whose mothers did not smoke has mean (x_2 ) ̅=0.095 g/cm, s_2=0.025 g/cm. Assume that the underlying population variances are equal. Are the two samples of data paired...
A study was conducted to determine whether an expectant mother’s cigarette smoking has any effect on...
A study was conducted to determine whether an expectant mother’s cigarette smoking has any effect on the bone mineral content of her otherwise healthy child. A sample of 90 newborns whose mothers smoked during pregnancy has mean bone mineral content 0.097 g/cm and standard deviation 0.027 g/cm; a sample of 160 infants whose mothers did not smoke has mean 0.090 g/cm and standard deviation 0.025 g/cm. Assume that the underlying population variances are equal. Conduct the test at the 0.05...
A researcher would like to examine the effect of labor unions on the average pay of...
A researcher would like to examine the effect of labor unions on the average pay of workers. The investigator obtains information from the National Carpenters Union, which states that the average pay for union carpenters is μ=$7.80 per hour. The researcher then obtains a random sample of 8 carpenters who do not belong to a union and records the pay for each. The data from this sample are as follows: 6.25, 7.50, 6.75, 6.90, 7.10, 7.15, 8.00, 6.15 per hour....
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT