Stats
posted by Mariaan .
A random sample of 30 women drank an average of 15 cups of coffee per week during examination finals,
with the sample standard deviation equal to 3 cups. A upper limit of an approximate confidence interval
with 95% of the population average cup drunk is ?

95% confidence interval = μ ± 1.96 SE
Standard Error (SE) = SD/√(n1)
Z = (xμ)/SE
1.96 = (x15)/SE
Solve for x.
I hope this helps.
Respond to this Question
Similar Questions

Statistics
1) For each of the following statements, formulate appropriate null and alternative hypotheses. Indicate whether the appropriate test will be onetailed or twotailed,then sketch a diagram that shows the approximate location of the … 
stats
A random sample of 40 men drank an average of 20 cups of coffee per week during examination final, with the population standard deviation equal to 6 cups. A lower limit of an approximate 95% confidence interval the population average … 
STATS
1Suppose that the fuel comsumption of cars for the same model is normally distributed. A random sample of ten new cars of the same model are randomly selected and their fuel consumption (l/100 km) is determined by subjecting them … 
STATS
12 The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 19.22. A random sample of salespeople was taken and the number of cars each sold is listed her. 79 43 58 66 101 63 79 … 
Statistics
The international Coffee Association has reported the mean daily coffee consumption for U.S. residents as 1.65 cups. Assume that a sample of 38 people from a North Carolina city consumed a mean of 1.84 cups of coffee per day, with … 
Statistics: Percentile Rank
A survey of college students was conducted during final exam week to assess the number of cups of coffee consumed each day. The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. A. What proportion … 
statistics
A survey of college students was conducted during final exam week to assess the number of cups of coffee consumed each day. The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. a. What proportion … 
Statistiscs
Students in the psychology department consume an average of 5 cups of coffee per day with a standard deviation of 1.75 cups. The number of cups of coffee consumed is normally distributed. • What proportion of students consume an … 
stats
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution, with a population standard deviation of $4. … 
probs & stats
1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could …