A random sample of 500 is taken from a much larger population and the 95% confidence interval for the population mean is calculated as 576 ± 23. A further and independent random sample of 500 is taken from the same population and a new 95% confidence interval for the population mean calculated on the combined sample of size 1,000. Which of the following is the most plausible new confidence intervalA random sample of 500 is taken from a much larger population and the 95% confidence interval for the population mean is calculated as 576 ± 23. A further and independent random sample of 500 is taken from the same population and a new 95% confidence interval for the population mean calculated on the combined sample of size 1,000. Which of the following is the most plausible new confidence intervalA random sample of 500 is taken from a much larger population and the 95% confidence interval for the population mean is calculated as 576 ± 23. A further and independent random sample of 500 is taken from the same population and a new 95% confidence interval for the population mean calculated on the combined sample of size 1,000. Which of the following is the most plausible new confidence intervalA random sample of 500 is taken from a much larger population and the 95% confidence interval for the population mean is calculated as 576 ± 23. A further and independent random sample of 500 is taken from the same population and a new 95% confidence interval for the population mean calculated on the combined sample of size 1,000. Which of the following is the most plausible new confidence interval